Finally dyno'd with the D1
Ed and I have now both "de-virginized" our aluminum ATI plenums. 
The last time mine popped a couple of months ago I went with a fabbed stainless airbox setup. I've seen and heard about the ATI plenums lasting at much higher PSI levels than the ~10 we're running though...
As a disclaimer for ATI we were running higher boost levels than the kit is designed for when they popped.
Rob (Bad30th)
The last time mine popped a couple of months ago I went with a fabbed stainless airbox setup. I've seen and heard about the ATI plenums lasting at much higher PSI levels than the ~10 we're running though...
As a disclaimer for ATI we were running higher boost levels than the kit is designed for when they popped.
Rob (Bad30th)
Thread Starter
Joined: Nov 2001
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From: Sunny San Diego
Originally Posted by frcefed98
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
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Joined: Nov 2001
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From: Sunny San Diego
Originally Posted by ty_ty13
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
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....
But the thing I don't understand is going from the P1 to the D1 didn't make more boost. I still made 10#
There are plenty of 4" stroke cars making peaks way higher, my solid roller 414 peaked at 7000rpm. I really dont know what to tell you guys since I have never had the same problem, if it is really a problem. I would run the car and see where its at and not get too hung up on the dyno numbers.
Is it possible the plenum was leaking some during the pull and then really blew out when you let off it?
Is it possible the plenum was leaking some during the pull and then really blew out when you let off it?
Thread Starter
Joined: Nov 2001
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From: Sunny San Diego
Originally Posted by kp
There are plenty of 4" stroke cars making peaks way higher, my solid roller 414 peaked at 7000rpm. I really dont know what to tell you guys since I have never had the same problem, if it is really a problem. I would run the car and see where its at and not get too hung up on the dyno numbers.
Is it possible the plenum was leaking some during the pull and then really blew out when you let off it?
Is it possible the plenum was leaking some during the pull and then really blew out when you let off it?
And peak boost is the same. I really thought going from a P1 to a D1 would have given at least 2 more pounds of boost.
On the first run yes (blue line). It shows in the dyno. But the 3rd one it held (green line).
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FormerVendor
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From: Hell AFB
My guess is the belt is slipping pretty good. A 3.20 pulley is damn small for a D1SC. You could try a new belt that is shorter and tension it really well, BUT traction is traction for these. We had this issue in the past and made a over drive crank pulley 1" bigger, unfortunately the machine shop we use went under and all the ones we have been quoted by want large quantity orders.
heh, if you were only seeing 10psi with a 3" pulley something is slipping or leaking. Like Jake said, a 3.2 is bad enough but a 3" is pretty rough. I never had any slip issues with the 3.4 though, I would try the 3.4 and see what happens 
FormerVendor
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From: Hell AFB
Originally Posted by Ed Blown Vert
You guys are probably right. Went looking for my other pulleys. Found the 3.4 and 3.2 which means I have the 3.0 on the blower opps! 
Thread Starter
Joined: Nov 2001
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From: Sunny San Diego
Originally Posted by Jake@EPP
My guess is the belt is slipping pretty good. A 3.20 pulley is damn small for a D1SC. You could try a new belt that is shorter and tension it really well, BUT traction is traction for these. We had this issue in the past and made a over drive crank pulley 1" bigger, unfortunately the machine shop we use went under and all the ones we have been quoted by want large quantity orders.
Richard Racing makes a 3.3 BP and I had ASP make me a Custom 3.2 BP for my application. I have yet to get the car together but I think as long as there is enough Tension on the belt, it shouldn't matter to much. A 3.2 BP doesn't seem that much smaller than a 3.4 but a 3.0 is getting pretty small.
Vortech uses small BP pulleys (Around 2.75) and many guys don't have problems with there setups
May have been asked b/c I just scanned through the pages but if your spinning the blower to the same RPM level (P1 and D1) you shouldn't see a lot of peak gain but more midrange IMO, but I could be wrong.
Vortech uses small BP pulleys (Around 2.75) and many guys don't have problems with there setups
May have been asked b/c I just scanned through the pages but if your spinning the blower to the same RPM level (P1 and D1) you shouldn't see a lot of peak gain but more midrange IMO, but I could be wrong.
The cam Im running on my car now is a 234/246 112 LSA and I think i need to go with a larger cam because Peak TQ happens at 4K RPM and I think HP won`t hold much after 5500RPM. IMO 4" strokes needs a larger duration on the intake side to skew peak TQ and HP towards the top end. I think my next cam choice would be something in the 242/252 113LSA range.
The FM7 i was running is a 224/230 114LSA cam and I was running that on a 346cid. I think the cam is your problem and you definatly need a 236/244 114LSA cam or something around that size for a 383.
The FM7 i was running is a 224/230 114LSA cam and I was running that on a 346cid. I think the cam is your problem and you definatly need a 236/244 114LSA cam or something around that size for a 383.
Thread Starter
Joined: Nov 2001
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From: Sunny San Diego
Originally Posted by T/A KID
Richard Racing makes a 3.3 BP and I had ASP make me a Custom 3.2 BP for my application. I have yet to get the car together but I think as long as there is enough Tension on the belt, it shouldn't matter to much. A 3.2 BP doesn't seem that much smaller than a 3.4 but a 3.0 is getting pretty small.
Vortech uses small BP pulleys (Around 2.75) and many guys don't have problems with there setups
May have been asked b/c I just scanned through the pages but if your spinning the blower to the same RPM level (P1 and D1) you shouldn't see a lot of peak gain but more midrange IMO, but I could be wrong.
Vortech uses small BP pulleys (Around 2.75) and many guys don't have problems with there setups
May have been asked b/c I just scanned through the pages but if your spinning the blower to the same RPM level (P1 and D1) you shouldn't see a lot of peak gain but more midrange IMO, but I could be wrong.
Thread Starter
Joined: Nov 2001
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From: Sunny San Diego
Originally Posted by LSs1Power
The cam Im running on my car now is a 234/246 112 LSA and I think i need to go with a larger cam because Peak TQ happens at 4K RPM and I think HP won`t hold much after 5500RPM. IMO 4" strokes needs a larger duration on the intake side to skew peak TQ and HP towards the top end. I think my next cam choice would be something in the 242/252 113LSA range.
The FM7 i was running is a 224/230 114LSA cam and I was running that on a 346cid. I think the cam is your problem and you definatly need a 236/244 114LSA cam or something around that size for a 383.
The FM7 i was running is a 224/230 114LSA cam and I was running that on a 346cid. I think the cam is your problem and you definatly need a 236/244 114LSA cam or something around that size for a 383.
