Finally dyno'd with the D1
Beats me on the peak power thing, my stock engines with prochargers peaked well over 6000rpm and held on to 64-6500 without falling off as quick as Ed's. But if the boost is just hanging at 10psi at a certain rpm and not going up the power is going to drop like a stone after a certain point. On a centrifugal car the boost should keep rising even though you are well past the peak of the cam. The increasing boost will level the power off somewhat, thats why I could shift a z06 cam at 7000rpm and run pretty well with it 
hey ed havent heard from you in awhile glad u finally got the D1 on,and kudos on the the nice area under the curve increase.sucks about the plenum blowing and lack of boost though.hope you get that figured out....question though.was this on race gas?the A/F ratio looking rather lean if im reading that right i see 12.3ish on parts????
Originally Posted by Ed Blown Vert
My friend was watching the boost gauge, it steadily climbed to 10# then held. Then barely hit 11# at the top of the run.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Originally Posted by ddnspider
hey ed havent heard from you in awhile glad u finally got the D1 on,and kudos on the the nice area under the curve increase.sucks about the plenum blowing and lack of boost though.hope you get that figured out....question though.was this on race gas?the A/F ratio looking rather lean if im reading that right i see 12.3ish on parts????
I did check some of my older dynos. And the peak moved to 5500 when I changed over to the 383. Before that, I was hitting peak HP at 6000. The stroke wouldn't change it that much?
No race gas. That was on 91. I was tuning with my wideband. AFR was 11.0-11.5 The dyno was about a point off.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Originally Posted by kp
There wont be a huge increase, I see maybe 1.5psi from 6000 to 7000rpm. It just doesnt make a lot of sense but ty-ty 13 is also peaking about the same with a simlar combo. Just fix everything and make a few passes, that 50hp across the board down low should make a pretty good difference, just experiment with different shift points and see what happens, dont get too hung up on the dyno numbers. Just remember with that 3.2 pully 6700rpm will max the D1 out.
I don't think I will ever need to spin it to 6700
6000 outta do. its a shot in the dark but its late and makes sense in my head....what if 1 of the 2 intercoolers arent flowing very well compared to the other one?would cause uneven pressures entering the plenum and might cause u blowing it up on only 10psi.
as far as the bigger stroke,adding those cubes from stock can make a bit of a difference its like with a turbo a T76 could make alot of hp cause it will be really efficient but on a 383 it wont make as much hp cause ur going out of the range after a certain point.generally speaking of course.
as far as the bigger stroke,adding those cubes from stock can make a bit of a difference its like with a turbo a T76 could make alot of hp cause it will be really efficient but on a 383 it wont make as much hp cause ur going out of the range after a certain point.generally speaking of course.
Originally Posted by Ed Blown Vert
I only mentioned that because of your previous post. I thought boost would always climb, just not power.
I don't think I will ever need to spin it to 6700 6000 outta do.
I don't think I will ever need to spin it to 6700
6000 outta do.I would still experiment with the shift points some, you might be surprised.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Originally Posted by ddnspider
its a shot in the dark but its late and makes sense in my head....what if 1 of the 2 intercoolers arent flowing very well compared to the other one?would cause uneven pressures entering the plenum and might cause u blowing it up on only 10psi.
as far as the bigger stroke,adding those cubes from stock can make a bit of a difference its like with a turbo a T76 could make alot of hp cause it will be really efficient but on a 383 it wont make as much hp cause ur going out of the range after a certain point.generally speaking of course.
as far as the bigger stroke,adding those cubes from stock can make a bit of a difference its like with a turbo a T76 could make alot of hp cause it will be really efficient but on a 383 it wont make as much hp cause ur going out of the range after a certain point.generally speaking of course.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Originally Posted by kp
It should always climb until you get way past max impeller, its hard to look at the boost gauge and the tach and see how long its hanging though thats why its nice to log it. It should steadily rise with rpm though. I was at nearly 15psi with a 3.4 pulley at 6000rpm with the D1SC with a similar cam so thats a huge difference. 40 less cubes and little more compression but still 50% and turning the blower slower is a lot. Maybe its the FMIC making that big of a difference, kyle and jeremy (forcefed98) did the 3.5 intercooler to FMIC swap with a maxed out d1 so I would ask them what kind of boost difference they seen with the IC swap. I never ran more then a P1SC on the dual 3.5s.
I would still experiment with the shift points some, you might be surprised.
I would still experiment with the shift points some, you might be surprised.
I am currently shifting @ 6400 so will drop that to about 6000 or so. Its better for the motor too.
I dont really want to go to a FMIC, but if that is the issue. I will. I would prefer the 4.5" coolers.
The 4.5 ICs would probably help, not saying to swap to a FMIC but I'd be curious to see what those guys were seeing with the d1s with the twin 3.5s when they were almost maxed out. Not to make you feel bad but I have hit over 750 through the TH400 and a D1 not really pushing it hard, so I agree something is up somewhere. Stevieturbo has trapped 148 or so with a 383 with a similar cam also I think so its not the engine combo unless its way off or its floating the valves or something..
welcome to my world of peaking before 6k rpms 
im not sure what the problem is with mine but maybe a larger blower will clear up the problems with these 4'' stroke motors... or maybe a huge cam... im not too concerned with it just yet b/c i've trapped 105 with it in the 1/8th soo far and really only made one full pass on MT dr's.... ill worry more about it this winter...
Tyler
im not sure what the problem is with mine but maybe a larger blower will clear up the problems with these 4'' stroke motors... or maybe a huge cam... im not too concerned with it just yet b/c i've trapped 105 with it in the 1/8th soo far and really only made one full pass on MT dr's.... ill worry more about it this winter...Tyler
That exact same blower did 580-630rwhp (with-without filter) on a mustang dyno on my car running on a stock engine with only a FM7 cam in it. I was running 3.85 pulley with the stock 3.5 intercoolers at the time seeing around 13psi. Im also using the SDCE setup. Peak TQ was around 4200 RPM while peak HP was around 6100 RPM. Maybe you need a slightly larger cam.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Originally Posted by kp
The 4.5 ICs would probably help, not saying to swap to a FMIC but I'd be curious to see what those guys were seeing with the d1s with the twin 3.5s when they were almost maxed out. Not to make you feel bad but I have hit over 750 through the TH400 and a D1 not really pushing it hard, so I agree something is up somewhere. Stevieturbo has trapped 148 or so with a 383 with a similar cam also I think so its not the engine combo unless its way off or its floating the valves or something..
Originally Posted by ty_ty13
welcome to my world of peaking before 6k rpms im not sure what the problem is with mine but maybe a larger blower will clear up the problems with these 4'' stroke motors... or maybe a huge cam... im not too concerned with it just yet b/c i've trapped 105 with it in the 1/8th soo far and really only made one full pass on MT dr's.... ill worry more about it this winter...
Tyler
im not sure what the problem is with mine but maybe a larger blower will clear up the problems with these 4'' stroke motors... or maybe a huge cam... im not too concerned with it just yet b/c i've trapped 105 with it in the 1/8th soo far and really only made one full pass on MT dr's.... ill worry more about it this winter...Tyler
Originally Posted by LSs1Power
That exact same blower did 580-630rwhp (with-without filter) on a mustang dyno on my car running on a stock engine with only a FM7 cam in it. I was running 3.85 pulley with the stock 3.5 intercoolers at the time seeing around 13psi. Im also using the SDCE setup. Peak TQ was around 4200 RPM while peak HP was around 6100 RPM. Maybe you need a slightly larger cam.
i have one but no scanner... i could fax it to you on monday if you want it...
im convinced its the combonation of the heads and cam on my motor... i think the cam is too small and the heads are crapp (241)...
im convinced its the combonation of the heads and cam on my motor... i think the cam is too small and the heads are crapp (241)...
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Can you send a pic? If not, a fax on mon will work.
I don't think its my heads. Maybe it is the cam or stroke
Green line is current. Red was my old 5.7L with a TR224 and the P1. Same heads
I don't think its my heads. Maybe it is the cam or stroke
Green line is current. Red was my old 5.7L with a TR224 and the P1. Same heads
Kev it was a night and day difference between the FMIC and the crap ati twins.
I was stuck at 11.5's with a best of 120mph with the ati twin set up. 12psi with a 3.4 and it was all it would make with the twins boost wise. I did manage to go 11.36@120mph with a small 50 shot.
With the FMIC and no other changes except for a clean up on the tune due to seeing more boost.
11.10@125mph with the FMIC and the car was producing 15-16psi. It would have gone faster but I sold it to you shortly after I went to the FMIC to persue turbocharging.
The twins were very restrictive and my IAT's were outrageous up here where the air is thin. 160-170 deg temps were the norm on a pass. Plus loosing all that plumbing that the ATI set up had was worth something i'd figure.
J
I was stuck at 11.5's with a best of 120mph with the ati twin set up. 12psi with a 3.4 and it was all it would make with the twins boost wise. I did manage to go 11.36@120mph with a small 50 shot.
With the FMIC and no other changes except for a clean up on the tune due to seeing more boost.
11.10@125mph with the FMIC and the car was producing 15-16psi. It would have gone faster but I sold it to you shortly after I went to the FMIC to persue turbocharging.
The twins were very restrictive and my IAT's were outrageous up here where the air is thin. 160-170 deg temps were the norm on a pass. Plus loosing all that plumbing that the ATI set up had was worth something i'd figure.
J
[QUOTE=Ed Blown Vert]Can you send a pic? If not, a fax on mon will work.
I don't think its my heads. Maybe it is the cam or stroke
Green line is current. Red was my old 5.7L with a TR224 and the P1. Same heads
arent you on a 383 now... not a 347?
i believe kp said that a 4'' stroke will make it peak earlier with the same cam... wich makes since... i had a 236TR cam in my 346 and it peaked at about 6300 rpms... a guy from comp suggested a smaller cam and now i peak at about 5800 rpms.... i also gain 1 pound in boost from 5800 rpms to 6300 rpms but drop about 55rwhp... that makes me think its a combo of my crap stock heads and a small cam in a big motor (224/236 .601/602 114lsa)
whatever i decide to do next will be done through a knowledgable sponsor like dezracing since they do a sh*t load of procharger RACE cars... or brent@EPP...
i just have a feeling it will end up being a cam like 242/254....
I don't think its my heads. Maybe it is the cam or stroke
Green line is current. Red was my old 5.7L with a TR224 and the P1. Same heads
arent you on a 383 now... not a 347?
i believe kp said that a 4'' stroke will make it peak earlier with the same cam... wich makes since... i had a 236TR cam in my 346 and it peaked at about 6300 rpms... a guy from comp suggested a smaller cam and now i peak at about 5800 rpms.... i also gain 1 pound in boost from 5800 rpms to 6300 rpms but drop about 55rwhp... that makes me think its a combo of my crap stock heads and a small cam in a big motor (224/236 .601/602 114lsa)
whatever i decide to do next will be done through a knowledgable sponsor like dezracing since they do a sh*t load of procharger RACE cars... or brent@EPP...
i just have a feeling it will end up being a cam like 242/254....
Originally Posted by Ed Blown Vert
Can you send a pic? If not, a fax on mon will work.
I don't think its my heads. Maybe it is the cam or stroke
Green line is current. Red was my old 5.7L with a TR224 and the P1. Same heads
I don't think its my heads. Maybe it is the cam or stroke
Green line is current. Red was my old 5.7L with a TR224 and the P1. Same heads