What fuel pump to use with my nitrous system

Mike Souslin · 06-10-2002, 10:33 PM

I am in the process of installing my Zex kit in my car. I currently have the mods listed below in my sig. I will start out with the 75 hp jetting but will eventually tune my way up the the 125 level. I have a 155 lph in tank now with the 24 lbs injectors and I was planning to step up to the 190 lph. Should I just skip that and go with the 255??? Will the return lines be able to handle that much fuel? Any advice would be greatly appreciated!

Thanks!

gtsr515 · 06-10-2002, 10:52 PM

With a 51cc chamber head, ANY nitrous use should be carefully thought out, I recommend you go with a 190 intank and a T-rex in-line, 30-36lb injectors, cold range plugs and timing at 8 degrees, an AFPR too. The return lines will not be an issue.

Eric4Nitrous · 06-10-2002, 10:57 PM

I agree with the above post. Anytime you use a 51CC head with Nitrous, you HAVE to be careful. Good luck with it and be safe!! I run two holley blue's on mine and one mallory 190 pump!

Eric

Mike Souslin · 06-10-2002, 11:37 PM

With my pistons, my compression ratio is just over 10.5:1 and I was always told the higher compression motors with aluminum heads and nitrous go well together??? Do I really need 30 or 36 pound injectors for just a 75 shot?? I do have the adjustable FPR and I also installed a window switch to turn on and turn off the flow of nitrous at specified rpms.

Thanks guy's.

gtsr515 · 06-10-2002, 11:55 PM

No sir, high compression is a proven NO NO with spray, even with aluminum heads that do add a bit of a cooling advantage over iron heads, when nitrous is introduced into the motor it effectively increases compression drastically. For example, purpose built nitrous motors are based on a low compression motor, like 8.5:1 or so. With 51cc chambers, you will need lots of fuel, and it will limit any high horsepower shots to a minimum. Good luck.

Stang Runner · 06-11-2002, 12:08 AM

Well not to mess you guys all Up but Many Racers Have LOTS of Compression and Run No2 and lots of it as well But...... they reabuild them all the time And Are Not EVERY Run on the street. Just saying you can But there is a risk yes with the Higher Compression. Better Fuel and More of it as well.

Skyman · 06-11-2002, 02:31 AM

No.

Nitrous and your compression is fine. Your just going to need to adjust the timing accordingly.

I would go with a 255lph Forced Induction Holley Fuel pump. It flows a lot more than the regular 255 and that will be fine.

Skyler

Mike Souslin · 06-11-2002, 02:31 AM

It is my understanding that nitrous does not increase the compression ratio but rather add a "dense" concentration of oxygen to allow you to burn more fuel thus making more combustion pressure. I know that blowers and turbo's do increase compression by forcing a larger volume of air into the cylinder and then compressing that mixture to achieve the same goal - more oxygen to burn more fuel to make more power.

LX XLR8R · 06-11-2002, 08:30 AM

we run a 255 intake pump with 19# injectors on a 150 dry shot...only mods to motor are ederbrock heads and a e303..this gets us mid 11 second time slips on slicks spraying out the hole..i have 10deg timing on pump gas and 12-13 on race gas..also i run 2 step colder autolites

302 LX Eric · 06-11-2002, 08:38 AM

Mike - Sounds like the 255lph is the one to go with.

Sky - what's the difference b/t the F/I Holley Pump and a 'regular' 255 pump. I've heard that the F/I Holley is better, just always wondered why. Thanks.

E

LX XLR8R · 06-11-2002, 05:35 PM

Quote:

Originally posted by 302 LX Eric
Mike - Sounds like the 255lph is the one to go with.

Sky - what's the difference b/t the F/I Holley Pump and a 'regular' 255 pump. I've heard that the F/I Holley is better, just always wondered why. Thanks.

E

it keeps the pressure higher under high fuel demands of forced indutcion

Skyman · 06-11-2002, 06:26 PM

Higher pressure and more flow. It really does more than 255, they just call it that.

Skyler

06-10-2002, 10:33 PM	#1
Mike Souslin Registered Member Join Date: Sep 1999 Location: Grove City Ohio Posts: 226	What fuel pump to use with my nitrous system I am in the process of installing my Zex kit in my car. I currently have the mods listed below in my sig. I will start out with the 75 hp jetting but will eventually tune my way up the the 125 level. I have a 155 lph in tank now with the 24 lbs injectors and I was planning to step up to the 190 lph. Should I just skip that and go with the 255??? Will the return lines be able to handle that much fuel? Any advice would be greatly appreciated! Thanks! __________________ 91 Coupe with fresh rebuild. Running Stage 2 Avenger heads (51cc chambers), Stage 2 cam (.549, .566)1.72 Crane Gold Race rockers, Port matched GT-40 upper & lower, 75mm Bullet MAF, 65mm Accufab TB, MSD 6AL, Long Tubes through off road and 2 chamber flowbastards. Stock T-5, 3.73 gears, Center Line Convo-Pros with skinnies up front. My baby is now bottle fed!!! Best time on the motor was 12.92 at 109.57. UPDATE - Getting Ready to install: Tremec 3550, Blowproof Bellhousing, Strange Shocks/Struts, Moroso Springs, Upper/Lower control Arms, 31 spline axles and new differential. After this..... 347 heart transplant and Rollcage.

06-10-2002, 10:52 PM	#2
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	With a 51cc chamber head, ANY nitrous use should be carefully thought out, I recommend you go with a 190 intank and a T-rex in-line, 30-36lb injectors, cold range plugs and timing at 8 degrees, an AFPR too. The return lines will not be an issue. __________________ Remember...2nd place is 1st place for losers!

06-10-2002, 10:57 PM	#3
Eric4Nitrous Registered Member Join Date: Jan 2002 Location: Va Posts: 1,122	I agree with the above post. Anytime you use a 51CC head with Nitrous, you HAVE to be careful. Good luck with it and be safe!! I run two holley blue's on mine and one mallory 190 pump! Eric __________________ 68 Camaro Gene Fulton 632ci Two stages of Jug 8.41 164mph Rockingham 1-26-03

06-10-2002, 11:37 PM	#4
Mike Souslin Registered Member Join Date: Sep 1999 Location: Grove City Ohio Posts: 226	With my pistons, my compression ratio is just over 10.5:1 and I was always told the higher compression motors with aluminum heads and nitrous go well together??? Do I really need 30 or 36 pound injectors for just a 75 shot?? I do have the adjustable FPR and I also installed a window switch to turn on and turn off the flow of nitrous at specified rpms. Thanks guy's. __________________ 91 Coupe with fresh rebuild. Running Stage 2 Avenger heads (51cc chambers), Stage 2 cam (.549, .566)1.72 Crane Gold Race rockers, Port matched GT-40 upper & lower, 75mm Bullet MAF, 65mm Accufab TB, MSD 6AL, Long Tubes through off road and 2 chamber flowbastards. Stock T-5, 3.73 gears, Center Line Convo-Pros with skinnies up front. My baby is now bottle fed!!! Best time on the motor was 12.92 at 109.57. UPDATE - Getting Ready to install: Tremec 3550, Blowproof Bellhousing, Strange Shocks/Struts, Moroso Springs, Upper/Lower control Arms, 31 spline axles and new differential. After this..... 347 heart transplant and Rollcage.

06-10-2002, 11:55 PM	#5
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	No sir, high compression is a proven NO NO with spray, even with aluminum heads that do add a bit of a cooling advantage over iron heads, when nitrous is introduced into the motor it effectively increases compression drastically. For example, purpose built nitrous motors are based on a low compression motor, like 8.5:1 or so. With 51cc chambers, you will need lots of fuel, and it will limit any high horsepower shots to a minimum. Good luck. __________________ Remember...2nd place is 1st place for losers!

06-11-2002, 12:08 AM	#6
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	Well not to mess you guys all Up but Many Racers Have LOTS of Compression and Run No2 and lots of it as well But...... they reabuild them all the time And Are Not EVERY Run on the street. Just saying you can But there is a risk yes with the Higher Compression. Better Fuel and More of it as well. __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

06-11-2002, 02:31 AM	#7
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	No. Nitrous and your compression is fine. Your just going to need to adjust the timing accordingly. I would go with a 255lph Forced Induction Holley Fuel pump. It flows a lot more than the regular 255 and that will be fine. Skyler __________________ 2001 BMW M3 6spd 12.79@108 RIP ---- 1993 Notch w/ 98 4V 4.6 Fasttt... -1989 Saleen Mustang #406- 12.32@109 -1999 Black Cobra Coupe- JBA Shorties, Bassani Cat-X, Magnaflow 3", Pulleys, 85mm Pro-M, Ported Intake, Soild Rear w/ 4.30s, Tubular Front End, X2C arms, 13lb batt, few others.

06-11-2002, 08:30 AM	#9
LX XLR8R Dirk Diggler Join Date: Feb 1999 Location: SLOATSBURG, NY Posts: 1,931	we run a 255 intake pump with 19# injectors on a 150 dry shot...only mods to motor are ederbrock heads and a e303..this gets us mid 11 second time slips on slicks spraying out the hole..i have 10deg timing on pump gas and 12-13 on race gas..also i run 2 step colder autolites __________________ 95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once

06-11-2002, 08:38 AM	#10
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	Get the 255 Mike - Sounds like the 255lph is the one to go with. Sky - what's the difference b/t the F/I Holley Pump and a 'regular' 255 pump. I've heard that the F/I Holley is better, just always wondered why. Thanks. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

06-11-2002, 06:26 PM	#12
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Higher pressure and more flow. It really does more than 255, they just call it that. Skyler __________________ 2001 BMW M3 6spd 12.79@108 RIP ---- 1993 Notch w/ 98 4V 4.6 Fasttt... -1989 Saleen Mustang #406- 12.32@109 -1999 Black Cobra Coupe- JBA Shorties, Bassani Cat-X, Magnaflow 3", Pulleys, 85mm Pro-M, Ported Intake, Soild Rear w/ 4.30s, Tubular Front End, X2C arms, 13lb batt, few others.

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