Do I Need More Fuel Pressure??/
FormerVendor
Joined: Apr 2005
Posts: 864
Likes: 0
From: Wichita Falls,Tx
Originally Posted by 02URPITFUL
I am using the NX dual Fogger kit. I am mesureing the fuel pressure at the end of the fuel rail. I do not know if it is accurate. When i had the 150 gas jets in there, when it hit the nitrous it spiiked to 17:1 and slowly went down to about 12:1, but it gradually fell. When i put the 200 gas jets in there and hit the nitrous it spiked to about 16:1 and dramatically fell to about 11:1 and from there fell to 10:1.
Originally Posted by Matt@HSW
Out of the box the Racetronix kit will support right around 600 rwhp. Adding in a fuel rail mounted fuel pressure regulator & return will improve on some of the factory fuel systems limitations therefore pushing support around 650 rwhp. Adding a boost a pump to the Racetronix harness (there is a provision for it) will allow for a bit more HP support.
Matt
Matt
But on to my point, you'd think that if the stock pump can handle almost 600 horse to the wheels, that the racetronix would handle a lot more than it does, just my opinion though. I wouldn't count on that stock pump supporting 570 at the wheels for long. I look at the fuel pump upgrade as a cheap insurance. $$ for the pump now or a lot more $$ later when the stock pump fails and takes out the motor. There are exceptions to every rule, but play with fire and chances are you'll eventually be burnt. 
To the person that started the thread, I would double-check the FP gauge. It sounds like the readings you are getting are not accurate.
Matt
To the person that started the thread, I would double-check the FP gauge. It sounds like the readings you are getting are not accurate.
Matt
Originally Posted by Loudmouth LS1
So why the hell did I buy a racetronix setup? My stock pump handled 570 at the wheels with no problem! My racetronix actually is handling my first stage now (which is a 200 shot) that put me at around 643 to the wheels, but it didn't like adding the second stage on top of it, hehe! But on to my point, you'd think that if the stock pump can handle almost 600 horse to the wheels, that the racetronix would handle a lot more than it does, just my opinion though.
But on to my point, you'd think that if the stock pump can handle almost 600 horse to the wheels, that the racetronix would handle a lot more than it does, just my opinion though. Matt, any word on the return at the rails/reg kit for the vette, from Racetronics? Hook me up, I'll take one of the kits? sorry for cutting into anothers post, but may be usefull to others in the pump problem area.
Robert
Robert
Originally Posted by Loudmouth LS1
So why the hell did I buy a racetronix setup? My stock pump handled 570 at the wheels with no problem! My racetronix actually is handling my first stage now (which is a 200 shot) that put me at around 643 to the wheels, but it didn't like adding the second stage on top of it, hehe! But on to my point, you'd think that if the stock pump can handle almost 600 horse to the wheels, that the racetronix would handle a lot more than it does, just my opinion though.
But on to my point, you'd think that if the stock pump can handle almost 600 horse to the wheels, that the racetronix would handle a lot more than it does, just my opinion though.570 with the stock pump??? LOL...your crazy man!
Thats the most I ever heard of. It must have been giving every last drop.
Anyways....the limits we throw around here...like 475-500 on the stock pump are with a margin of safety in mind. Not to mention not many are willing to actually find the limit. Same goes for the Racetronix and Walbros. I have used a Walbro/hotwire kit/Caspers voltage balster for 725-750 rwhp about three or four times without inceident. The pressure drop on spray is usually about 5 psi at that HP. Not perfect...but there is still room. And AF stays rock solid. Including one pull that was about 740 rwhp all dry through the injectors. AF was rock solid.
Originally Posted by Matt@HSW
I wouldn't count on that stock pump supporting 570 at the wheels for long. I look at the fuel pump upgrade as a cheap insurance. $$ for the pump now or a lot more $$ later when the stock pump fails and takes out the motor. There are exceptions to every rule, but play with fire and chances are you'll eventually be burnt.
To the person that started the thread, I would double-check the FP gauge. It sounds like the readings you are getting are not accurate.
Matt
To the person that started the thread, I would double-check the FP gauge. It sounds like the readings you are getting are not accurate.
Matt
And the racetronix handled both stages for the few seconds it took to make the dyno pull, a/f was at 10.1/1 on both kits and then started to lean out a little at the end of the pull when gettin close to 7000 rpm and went to like 11.0/1, but I figured it was just cuz I was gettin up in the rpms, but I guess it just can't keep up the fuel, cuz when I went to the track, it handled it for first gear and that was about it, right after hittin second, she burnt up a plug and I let right off when I heard it start to break up. My laptop had broke, so I had no datalogging to look at, but she definately went lean, i'm sure the racetronix didn't like 713rwhp (through a turbo 400 no less) under load, hehe! 
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Originally Posted by 383LQ4SS
570 with the stock pump??? LOL...your crazy man!
Thats the most I ever heard of. It must have been giving every last drop.
Anyways....the limits we throw around here...like 475-500 on the stock pump are with a margin of safety in mind. Not to mention not many are willing to actually find the limit. Same goes for the Racetronix and Walbros. I have used a Walbro/hotwire kit/Caspers voltage balster for 725-750 rwhp about three or four times without inceident. The pressure drop on spray is usually about 5 psi at that HP. Not perfect...but there is still room. And AF stays rock solid. Including one pull that was about 740 rwhp all dry through the injectors. AF was rock solid.
Thats the most I ever heard of. It must have been giving every last drop.
Anyways....the limits we throw around here...like 475-500 on the stock pump are with a margin of safety in mind. Not to mention not many are willing to actually find the limit. Same goes for the Racetronix and Walbros. I have used a Walbro/hotwire kit/Caspers voltage balster for 725-750 rwhp about three or four times without inceident. The pressure drop on spray is usually about 5 psi at that HP. Not perfect...but there is still room. And AF stays rock solid. Including one pull that was about 740 rwhp all dry through the injectors. AF was rock solid.
)! I could definately tell the difference though, cuz I had always been told that the tnt kits run real rich, but when I was hittin the 100 shot with the stock pump, o2's stayed the same as on motor, maybe slightly richer, like 920's/930's instead of 900's, but when I put the racetronix pump in, no changes to tune, she started goin way rich, but motor tune was perfect at 12.8-13.0/1! But from what i've heard from all the guys sprayin 300+ hp, you want the a/f to be around 10.1/1 area, so that's fine. On the first stage tnt 200 alone, it drops below 10.0/1, but when I added the second stage dry, she went to 10.1/1 and then like I said, just started to come up a little toward the higher rpms (which I think the pump was starting not to be able to keep up). Once I get the standalone, i'm gonna have to grab a wideband so I can keep an eye on it and see where's it's at, cuz I am scared to put the car back on a dyno, last time I took out second gear in the turbo 400 cuz I shook the tires on both stages.The other funny thing, I think if I put the 100 shot back in there now, that I wouldn't run as good as I did when I had the stock pump in, unless I started messing with the fuel jets to lean it out some, cuz I went 10.20's @ 134.xx on the 100 shot with stock pump, and when I put the 150's in with the racetronix and how rich it runs now, I only gained 2 mph and went 9.95 @ 136.xx.
By the way, what a/f do you recommend for a 200 - 300 shot, am I running it way too rich at 10.1/1, is there power left on the table making it leaner w/o being dangerous?
Last edited by Loudmouth LS1; Mar 4, 2006 at 11:48 AM.
I have usually shoot for right around 11.0-11.3 to 1 on a 300 shot. It does make quite a bit of difference. I have done direct ports or other setups where the AF would go from 10.0 and gradually rise to 13.0. You could really see the power jump as AF approached 11.0-11.5 and then fall back off after 12+.
Originally Posted by 383LQ4SS
I have usually shoot for right around 11.0-11.3 to 1 on a 300 shot. It does make quite a bit of difference. I have done direct ports or other setups where the AF would go from 10.0 and gradually rise to 13.0. You could really see the power jump as AF approached 11.0-11.5 and then fall back off after 12+.
Originally Posted by 383LQ4SS
I have usually shoot for right around 11.0-11.3 to 1 on a 300 shot. It does make quite a bit of difference. I have done direct ports or other setups where the AF would go from 10.0 and gradually rise to 13.0. You could really see the power jump as AF approached 11.0-11.5 and then fall back off after 12+.
Robert
Originally Posted by Robert56
Al was that 11.0/11.3 running a high octane fuel? What's your opinion on 11.5/11.7 and some 100 octane/93 octane mix for a 250/300 shot, as this is where I am shooting for right now. Actually, my custom fuel curve is 11.7 starting, with 11.5 at torque peak, then going back to 11.7 at redline, so now I am just going to add a mix of fuel, what do think, would you go a little richer? Total hp will be about 600 or slightly higher, and timing is currently at 22*, which I will likely lower.
Robert
Robert
Good point Robert....that was on C16.
When I used to run a 300 shot all dry for about 715 total I could get away with 100 octane unleaded and it seemed to like the AF a lil higher...maybe 11.8 or so.
As far as on the dyno and at the track..I alwasy just used the dyno to get close. The made small changes at the track to see what worked.
When I used to run a 300 shot all dry for about 715 total I could get away with 100 octane unleaded and it seemed to like the AF a lil higher...maybe 11.8 or so.
As far as on the dyno and at the track..I alwasy just used the dyno to get close. The made small changes at the track to see what worked.
