Best way to get 300hp from fox body - Page 2

90dpscoupe · 10-04-2001, 03:30 AM

hardened pushrods, and rockers are a must, because tfs are stud mounted, just thought id point that out.

Hyper92GT · 10-04-2001, 12:07 PM

Unit i disagree about the fuel system. All he needs is a larger pump maybe a 190lph. I'm running stock injectors, maybe I could benefit a bit from 24lbers but not by much, and bigger injectors are definitly not on the top of the proirity list if its NA(under 350hp). You are right it is the small stuff that makes all the difference..pay attention to it.
90dpsCoupe with a 98 MPH trap your prob. making closer to 245fwhp, stock cars run 96-98 mph..et is a function (largely) of traction at this level. However, the suggestions so far are good for 300+fwhp.
Good luck.
Mike

------------------
306ci, TFS stage 3 heads. port/pol edlebrock performer intake.
75mm mass air, 70mm TB, crane 2030 cam, Mac full length headers, flowmasters
3.73 gears, pulleys, March ram-air, AFPR...
Best to date: 13.53@110.07mph on a hot/humid day!
287RWHP, 306RWTQ

[This message has been edited by Hyper92GT (edited 10-04-2001).]

Stang_Crazy · 10-04-2001, 05:25 PM

I apologize if I might have confused some people. I meant that I am going to get the MAF, pushrods, rockers, etc. after I BUY the heads, intake, and cam. Then, Once I have it all purchased, they will all be installed. I'm sorry that I was confusing in my statement.

------------------
SOLD: 91 GT AOD 14.71@91.78mph
89 GT 5-speed: No times yet...STOCK!! 58k miles

Unit 5302 · 10-04-2001, 07:26 PM

Quote:

Originally posted by Hyper92GT:
Unit i disagree about the fuel system. All he needs is a larger pump maybe a 190lph. I'm running stock injectors, maybe I could benefit a bit from 24lbers but not by much, and bigger injectors are definitly not on the top of the proirity list if its NA(under 350hp). You are right it is the small stuff that makes all the difference..pay attention to it.

While perfectly functioning 19lb injectors will retain stock injection cycle qualities for 350hp N/A at a tick over 60psi (upper limit of most AFPR's), start throwing in a cam that likes extra fuel, and 13 year old injectors and you're running on the ragged edge. The TFS combo suggested should make 350hp pretty easy with proper tuning. I would honestly say your car is probably being held back by using the 19lbers as you are at about 346hp at the flywheel with Stage III TFS heads. I would have expected higher hp levels with a stage III job to them, but really, you can't get much higher than you are with 19lbers. The computer has some ability to compensate with injector cycles, but pushing the fuel system is never a good idea in my opinion. Why spend $2500 building an engine only to skimp on a $200 part and burn it down? Again, it's just my opinion.

I forgot about the fuel pump (he'll need that in either case), a 155 will do just fine.

Hyper92GT · 10-04-2001, 09:08 PM

UNIT I completely agree with you I am pushing the limit, and my fuel pressure is only set at 40psi - I don't want to tax the system either. However, with the build up we are discussing, is not mine, stock injectors should suffice. Injectors are my next upgrade but I don't know how much HP they will be worth? Any ideas? I was a little disappointed with my HP numbers but it is a blower motor with low comp. BTW I wish my motor was only $2500 bucks, that doesnt even cover the heads!

------------------
306ci, TFS stage 3 heads. port/pol edlebrock performer intake.
75mm mass air, 70mm TB, crane 2030 cam, Mac full length headers, flowmasters
3.73 gears, pulleys, March ram-air, AFPR...
Best to date: 13.53@110.07mph on a hot/humid day!
287RWHP, 306RWTQ

[This message has been edited by Hyper92GT (edited 10-04-2001).]

Unit 5302 · 10-04-2001, 11:13 PM

Do you have an FMU?? 40psi with 19lb/hr injectors on just an adjustable FPR and I'd expect your injectors to never stop. They must be on injection cycle constantly?

To keep the stock injection cycle you'd only be making 230hp. To simulate stock injectors according to the Stang Analyzer, you'd need 68psi (in tank pumps are rated at 70psi). I did some math, the stang analyzer is pretty accurate. You're asking your computer to compensate nearly 50% by injector cycle.

The thing to remember is that you are low compression, and he won't be. 350hp is right about where he should be.

Before upgrading injectors I would bump the fuel pressure. The pump should be running at 70psi for rated Lph, so setting your AFPR at 60psi should get you about 32% more flow or so. If your computer is capable of staying at that huge adjustment factor you'd be able to run 19lb injectors to 455hp, which is insane!!!! Bumping your fuel pressure to 60psi should allow for a better spray pattern, and a crisper injector cycle. I would expect a jump in throttle response, and better power levels with that if everything went by the book.

I cannot explain how you are able to obtain those numbers by math, but hey, it's a car so physics doesn't apply. You know, you drop a nut on the engine while you're working, and when you find it, it's at the back of the car wedged behind the tire. LOL!! I hate that!

Hyper92GT · 10-05-2001, 08:31 AM

No FMU just a 190pump and AFPR. I don't really want to crank it up to 60psi !!! I might be goning to the track this weekend so I will try 45, then 50 see what happens. I am not by any means a guro when it comes to fuel systems and the stock computer/injectors.
Your are correct with higer comp motor more fuel is better.
Mike

2FastLX · 10-05-2001, 10:09 AM

I have yet to make it to a dyno to see what my actual numbers are, and I don't even have track times with the new gears so there's another figure I can't quote you. But I will say this - Why not port the stock heads? I ported mine myself which was my first attempt at porting heads and I think they are flowing great and work well for my setup. I have around $300 in the heads counting the new valve springs and a 3 angle valve job. I know a set of aftermarket heads will do wonders over a stock head, but for an 18mpg street car that'll smoke LS1's all day long I can't complain.

Just a thought.

------------------
Gunning for 12's!

Buy your parts here
ICQ# 42269241

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
opinions on body mods	stanger9219	Appearance & Detailing	0	04-24-2004 11:10 PM
Need Throttle Body & Idle Conrol Valve Info	BigBobsL	Windsor Power	2	02-10-2004 01:16 AM
Bbk/edelbrock Throttle Body Sticking	sn95gt19	Windsor Power	4	06-25-2002 02:01 PM
Any body in Orlando that does paint and body work?PEASE read	robertwigton	Windsor Power	0	12-18-2001 02:15 AM
Please help w/Throttle Body install question??	Ersel	Modular Madness	1	07-08-2000 06:04 PM

10-04-2001, 03:30 AM	#21
90dpscoupe Registered Member Join Date: Jun 2000 Location: sanantonio, Tx, usa Posts: 1,407	hardened pushrods, and rockers are a must, because tfs are stud mounted, just thought id point that out.

10-04-2001, 12:07 PM	#22
Hyper92GT slow like mud Join Date: Mar 2000 Location: toronto Posts: 180	Unit i disagree about the fuel system. All he needs is a larger pump maybe a 190lph. I'm running stock injectors, maybe I could benefit a bit from 24lbers but not by much, and bigger injectors are definitly not on the top of the proirity list if its NA(under 350hp). You are right it is the small stuff that makes all the difference..pay attention to it. 90dpsCoupe with a 98 MPH trap your prob. making closer to 245fwhp, stock cars run 96-98 mph..et is a function (largely) of traction at this level. However, the suggestions so far are good for 300+fwhp. Good luck. Mike ------------------ 306ci, TFS stage 3 heads. port/pol edlebrock performer intake. 75mm mass air, 70mm TB, crane 2030 cam, Mac full length headers, flowmasters 3.73 gears, pulleys, March ram-air, AFPR... Best to date: 13.53@110.07mph on a hot/humid day! 287RWHP, 306RWTQ [This message has been edited by Hyper92GT (edited 10-04-2001).]

10-04-2001, 05:25 PM	#23
Stang_Crazy It's never clean enough! Join Date: Jan 1999 Location: Shaler, PA Posts: 1,542	I apologize if I might have confused some people. I meant that I am going to get the MAF, pushrods, rockers, etc. after I BUY the heads, intake, and cam. Then, Once I have it all purchased, they will all be installed. I'm sorry that I was confusing in my statement. ------------------ SOLD: 91 GT AOD 14.71@91.78mph 89 GT 5-speed: No times yet...STOCK!! 58k miles

10-04-2001, 09:08 PM	#25
Hyper92GT slow like mud Join Date: Mar 2000 Location: toronto Posts: 180	UNIT I completely agree with you I am pushing the limit, and my fuel pressure is only set at 40psi - I don't want to tax the system either. However, with the build up we are discussing, is not mine, stock injectors should suffice. Injectors are my next upgrade but I don't know how much HP they will be worth? Any ideas? I was a little disappointed with my HP numbers but it is a blower motor with low comp. BTW I wish my motor was only $2500 bucks, that doesnt even cover the heads! ------------------ 306ci, TFS stage 3 heads. port/pol edlebrock performer intake. 75mm mass air, 70mm TB, crane 2030 cam, Mac full length headers, flowmasters 3.73 gears, pulleys, March ram-air, AFPR... Best to date: 13.53@110.07mph on a hot/humid day! 287RWHP, 306RWTQ [This message has been edited by Hyper92GT (edited 10-04-2001).]

10-04-2001, 11:13 PM	#26
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Do you have an FMU?? 40psi with 19lb/hr injectors on just an adjustable FPR and I'd expect your injectors to never stop. They must be on injection cycle constantly? To keep the stock injection cycle you'd only be making 230hp. To simulate stock injectors according to the Stang Analyzer, you'd need 68psi (in tank pumps are rated at 70psi). I did some math, the stang analyzer is pretty accurate. You're asking your computer to compensate nearly 50% by injector cycle. The thing to remember is that you are low compression, and he won't be. 350hp is right about where he should be. Before upgrading injectors I would bump the fuel pressure. The pump should be running at 70psi for rated Lph, so setting your AFPR at 60psi should get you about 32% more flow or so. If your computer is capable of staying at that huge adjustment factor you'd be able to run 19lb injectors to 455hp, which is insane!!!! Bumping your fuel pressure to 60psi should allow for a better spray pattern, and a crisper injector cycle. I would expect a jump in throttle response, and better power levels with that if everything went by the book. I cannot explain how you are able to obtain those numbers by math, but hey, it's a car so physics doesn't apply. You know, you drop a nut on the engine while you're working, and when you find it, it's at the back of the car wedged behind the tire. LOL!! I hate that!

10-05-2001, 08:31 AM	#27
Hyper92GT slow like mud Join Date: Mar 2000 Location: toronto Posts: 180	No FMU just a 190pump and AFPR. I don't really want to crank it up to 60psi !!! I might be goning to the track this weekend so I will try 45, then 50 see what happens. I am not by any means a guro when it comes to fuel systems and the stock computer/injectors. Your are correct with higer comp motor more fuel is better. Mike

10-05-2001, 10:09 AM	#28
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	I have yet to make it to a dyno to see what my actual numbers are, and I don't even have track times with the new gears so there's another figure I can't quote you. But I will say this - Why not port the stock heads? I ported mine myself which was my first attempt at porting heads and I think they are flowing great and work well for my setup. I have around $300 in the heads counting the new valve springs and a 3 angle valve job. I know a set of aftermarket heads will do wonders over a stock head, but for an 18mpg street car that'll smoke LS1's all day long I can't complain. Just a thought. ------------------ Gunning for 12's! Buy your parts here ICQ# 42269241