Car is seeing 12psi now.....
TECH Addict
Joined: Nov 2001
Posts: 2,207
Likes: 0
From: College Station, Tx
Re: Car is seeing 10psi now..... You just pulled of the K&N? I would try taking off all the intake tubing in front of the blower (you can but a mesh screen over it). But 2psi is a pretty significant gain still.
I would echo PSJ's question - that will give us a good idea of what the blower is flowing. If you have the D1 maxxed out and aren't over 600rwhp something is still wrong.
I would also suggest getting some low-z injectors and a converter box instead of just going up to 50's or 55's. The drivability of the low-z's (I have 83's) is MUCH better than the others, and especially if you are contemplating a blower swap in the future they will be the way to go. Racetronix has some nice prices on these injectors, flow matched to boot.
I would echo PSJ's question - that will give us a good idea of what the blower is flowing. If you have the D1 maxxed out and aren't over 600rwhp something is still wrong.
I would also suggest getting some low-z injectors and a converter box instead of just going up to 50's or 55's. The drivability of the low-z's (I have 83's) is MUCH better than the others, and especially if you are contemplating a blower swap in the future they will be the way to go. Racetronix has some nice prices on these injectors, flow matched to boot.
Re: Car is seeing 10psi now..... BIGBOS, whats ur cam specs? and why dont u try putting a smaller blower pulley and rev up to 6300RPM only. I think U should be able to make more boost before reaching the impller speed. I would also look into a big FMIC instead of the two small ones.
Joined: Mar 2002
Posts: 2,032
Likes: 26
From: A Racetronix dealer near you...
Re: Car is seeing 10psi now.....
I would also suggest getting some low-z injectors and a converter box instead of just going up to 50's or 55's. The drivability of the low-z's (I have 83's) is MUCH better than the others, and especially if you are contemplating a blower swap in the future they will be the way to go. Racetronix has some nice prices on these injectors, flow matched to boot.
Jack
Racetronix
__________________
Manufacturer / Distributor of Automotive Fuel Systems, Components & Electronics
Please support a Racetronix dealer near you for personalized service.
>WEB SITE<
Manufacturer / Distributor of Automotive Fuel Systems, Components & Electronics
Please support a Racetronix dealer near you for personalized service.
>WEB SITE<
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: Car is seeing 10psi now..... You don't need a converter box for the 57lbs?
The 57's sound tempting if I don't need one, is says hi impedance...they are 65 a piece, so it turns out to be $520 for the set....compared to a little less for the 83's, but having to pay somewhere around 300 for a converter box....
I have a 214/218 .540/.550 114lsa cam in there...
I didn't get the exact #'s from Speed, but he said it was a little under 500rwhp, and it was hitting 12psi and said it would probably climb from there...(this was with the filter off)
But the AFR was 13.2:1 so they shut it down...it needs to be a lot lower than that..
Is my 255intank and 255inline doing the job?
The car is going on the dyno tomorrow morning, we are trying it with an adjustable fuel pressure regulator to see if that helps...
The 57's sound tempting if I don't need one, is says hi impedance...they are 65 a piece, so it turns out to be $520 for the set....compared to a little less for the 83's, but having to pay somewhere around 300 for a converter box....
I have a 214/218 .540/.550 114lsa cam in there...
I didn't get the exact #'s from Speed, but he said it was a little under 500rwhp, and it was hitting 12psi and said it would probably climb from there...(this was with the filter off)
But the AFR was 13.2:1 so they shut it down...it needs to be a lot lower than that..
Is my 255intank and 255inline doing the job?
The car is going on the dyno tomorrow morning, we are trying it with an adjustable fuel pressure regulator to see if that helps...
TECH Addict
Joined: Nov 2001
Posts: 2,207
Likes: 0
From: College Station, Tx
Re: Car is seeing 10psi now..... I have never used those exactly (the 57's) so don't know for sure. MSD 50's I tuned for a friend did *not* seem very happy at low DC's. The SVO 42's are probably the best "big" high-z injector I have experience with - but they aren't as nice as the low-z 83's. Seen some accel 48's which locked up at 7lbs of boost, but then it seems like all the accel injectors are problematic. Since the current to the solenoid is limited by the drivers, what makes the Siemens that much better than their counterparts - is the pintle/ball (don't know what they use?) much lighter.
Also, do you all (Racetronix) have the ability to measure the injector "offset" (solenoid open time), or do you have access to this data from the manufacturer? It would be interesting to compare these 57's to the SVO 42's, which we have Ford data for at least.?
Bigbos; Did you get a RPM value for the hp number?
Did they notice if your FP was dropping at all? (that will tell you if you have adequate fuel volume) - and what was your injector PW/DC like? The leaning issue could have been from a maf maxing out issue - your injectors *should* be fine at 500rwhp assuming you are maintaining fuel volume (and you should be fine there at 500 also)
But then with your motor and a D1 @ 12psi you should be higher - unless the 500 was at a lower rpm value.
Also, do you all (Racetronix) have the ability to measure the injector "offset" (solenoid open time), or do you have access to this data from the manufacturer? It would be interesting to compare these 57's to the SVO 42's, which we have Ford data for at least.?
Bigbos; Did you get a RPM value for the hp number?
Did they notice if your FP was dropping at all? (that will tell you if you have adequate fuel volume) - and what was your injector PW/DC like? The leaning issue could have been from a maf maxing out issue - your injectors *should* be fine at 500rwhp assuming you are maintaining fuel volume (and you should be fine there at 500 also)
But then with your motor and a D1 @ 12psi you should be higher - unless the 500 was at a lower rpm value.
Re: Car is seeing 10psi now..... Bos, you need to write down all the pertinent info and then assess what changes you might need to make... to hit your goals.
At the end the day, it's all about goals and hitting them. If you don't keep a goal in mind then the car will just be all over the place and it won't be a fun hobby/ interest anymore.
At the end the day, it's all about goals and hitting them. If you don't keep a goal in mind then the car will just be all over the place and it won't be a fun hobby/ interest anymore.
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
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: Car is seeing 10psi now..... Well my current goal w/the car was to hit 12psi and make around 600rwhp, but I'm barely hitting 500rwhp on 12psi..my track goal is low 10's, and high 9's in the future, there have been a few speed bumps...experiementing w/different pulleys, taking the cone filter off (which helped a lot) and then to the injectors maxing out..
I know I need to rework the fuel system if I'm ever going to get where I want to be, but at this point, I'm out of cash, and my paychecks at the moment can supply me w/a new set of injectors, but not a FAST system and an F1 procharger...if the injectors max out again today w/the addition of the regulator, then I will probably buy those hi - impedance 57LB injectors....or go to 83's and a converter box...
If all goes well, I will take the car as is, run it at the track next saturday at the MFBA rental and see how it does...
I know I need to rework the fuel system if I'm ever going to get where I want to be, but at this point, I'm out of cash, and my paychecks at the moment can supply me w/a new set of injectors, but not a FAST system and an F1 procharger...if the injectors max out again today w/the addition of the regulator, then I will probably buy those hi - impedance 57LB injectors....or go to 83's and a converter box...
If all goes well, I will take the car as is, run it at the track next saturday at the MFBA rental and see how it does...
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Re: Car is seeing 10psi now..... Dont forget you are through a non lock up 400 tranny too. They suck quite a lot of HP 
I would look at FP first. Can you raise your base FP to give yourself a little more room with the current injectors?
Cheers,
Chris
I would look at FP first. Can you raise your base FP to give yourself a little more room with the current injectors?
Cheers,
Chris
Re: Car is seeing 10psi now..... Brian, something doesn't seem right. My car made 592RWHP with 42.5lb injectors. The A/F was 11.4 at 6200rpms when I let off. I have an inline 392 pump, and the stocker in the tank. I don't think it matters that I was on 100oct, not sure though? A little baffled, Angelo
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: Car is seeing 10psi now..... They had the car on the dyno, the fuel pressure was raised to 68psi, that solved the injector problem, but then it showed to be running out of fuel again, so it looks like the pumps aren't keepin up, the fuel pressure just dropped...
They are going to try something tomorrow, if that doesn't work, I'm going to do twin intanks...
What intanks should I go with 340's? Whats the cost for the twins?
There is the option of also doing twin in-line Walbro GSL392 pumps and a Racetronix harness that will support upwards of 1000HP using -8 lines....but again, how much for something like this?
They are going to try something tomorrow, if that doesn't work, I'm going to do twin intanks...
What intanks should I go with 340's? Whats the cost for the twins?
There is the option of also doing twin in-line Walbro GSL392 pumps and a Racetronix harness that will support upwards of 1000HP using -8 lines....but again, how much for something like this?
Re: Car is seeing 10psi now..... Remember Scottietoohottie hit 600rwhp and went 10.3 with a 3800 lb tank...
It does sound like your fuel system is having a hard time keeping up.
Intmd8 has dual intanks on his car and his car is working pretty good.
You can go more radical and get twin external Bosch pumps and get the drag tank.
I have a single external pump good for 1200 hp but it's not streetable until I add a stepdown box.
It does sound like your fuel system is having a hard time keeping up.
Intmd8 has dual intanks on his car and his car is working pretty good.
You can go more radical and get twin external Bosch pumps and get the drag tank.
I have a single external pump good for 1200 hp but it's not streetable until I add a stepdown box.
Re: Car is seeing 10psi now..... Jack at Racetronix is pretty reasonable on the harness prices...I had him custom make me a harness for my dual externals.
I will be running two external Walbro pumps as well on my setup with a sumped '98 tank. I don't remember what the cost on all of the parts was, but I am guessing that I will probably have close to 2k+ into my fuel system when all is said and done.
I will be running two external Walbro pumps as well on my setup with a sumped '98 tank. I don't remember what the cost on all of the parts was, but I am guessing that I will probably have close to 2k+ into my fuel system when all is said and done.
TECH Addict
Joined: Nov 2001
Posts: 2,207
Likes: 0
From: College Station, Tx
Re: Car is seeing 10psi now..... I think the 340's go for around 110-130. I don't remember the exact breakdown, but for my LT1 it was around 350 for the two pumps, fittings, and misc lines I needed to make my own dual intank setup.
Thread Starter
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
Likes: 0
From: Chi-Town, IL
Re: Car is seeing 10psi now..... They had the car on the dyno today, the fuel is keeping up now....but now that the power starts to come on its shreading belts...it hits 12psi, then drops to 10....
What else could be the problem with my 7.85" crank 8 rib pulley and 3.3" 8 rib blower pulley...
What else could be the problem with my 7.85" crank 8 rib pulley and 3.3" 8 rib blower pulley...
TECH Addict
Joined: Nov 2001
Posts: 2,207
Likes: 0
From: College Station, Tx
Re: Car is seeing 10psi now..... How is the pulley alignment? You can put a straightedge on the blower and crank pulley to see if they are on the same plane or not - if so you may need to shim them out. Is the bracket flexing under boost? Is it possible the belt is coming in contact with anything under load?