Max HP at what RPM????

Dark_5.0 · 03-25-2002, 01:54 PM

My car is an entirely different animal since I installed the heads, intake, and FPR......It revs to 6500 easy........Where should I be shifting at . It feels like it pulls all the way to 6500rpms???

Hozer 88GTConv · 03-25-2002, 01:59 PM

I've got a similar setup, and I've got a date with a dyno this Wednesday at 3. I'll post the curve and we'll both figure out where to shift.

mustang17 · 03-25-2002, 02:16 PM

What cam do you have?

6500 seems high. I would think with a mild cam you would be more in the 5500 range.

With the stock computer, you're not hitting the rev limiter? I'd like to see what the dyno says.

Jeb_Bush_2000 · 03-25-2002, 02:47 PM

Is it just me, or does that seem awfully high for a stock bottom-end?

mustang17 · 03-25-2002, 03:22 PM

No, it's not just you, Jeb.

Seems high for the cam, bottom end, and maybe the valve train.

There has to be an error with the tact or something.

Dark_5.0 · 03-25-2002, 04:36 PM

My car does not have a rev limiter .....I dont know if the previous owner did something to it or what?

I was using the stock tach but I though it must be off. I went home and hooked an aftermarket tach up and my tach shows to be dead on up to 4000 but then about 500rpms off from there up so my car still pulls up to 6000rpms instead of 6500.

That still seems high to me. It appears I will have to shift at about 6000rpms.

Oh yeah....I have the stock cam.

fiveohpatrol · 03-25-2002, 05:08 PM

the stock rev limiter is 6250RPM. So I'm sure your tach is just off and you arent quite there yet even though its reading 6500

With the stock cam, mine always ran the best at the track shifting it at like 5400 (on an autometer tach).

And seeing how our combo's are pretty much the same, thats what I would reccomend for you too.

good luck
- Drew

Stang Runner · 03-25-2002, 05:22 PM

I have the stock cam and it Pulls Very hard to 6200 I bet 5900-6100 is the Max HP on it I will get it on a dyno this year sometime.

Unit 5302 · 03-25-2002, 08:00 PM

I don't really see a problem with running the stock bottom end to 6500rpm. I'd be more concerned about the valvetrain.

Wigged out E7's can flow up to about 220cfm with CNC jobs and bigger valves. With the stock cam, I'd expect best shift performance to be below 6000rpm.

The stock tach can get really crazy up in the r's. I took mine to fuel cutoff to see how far the tach was off. I hit 7000rpm on the factory tach before the 6250rpm fuel cutoff kicked in.

exgmguy · 03-25-2002, 11:17 PM

You will never make peak power at 6000 RPM with a stock cam.

My combo is a rebuilt 302 with an E-303 with 1.72 rockers, mildly ported TFS TW heads, Holley Systemax intake, 65 mm throttle body, 24 lb injectors, C&L 73 meter, and equal shorties.

My peak power on the dyno was at 5800 RPM. Which means I should shift at approx. 6000 RPM for the best time slip.

If you are reading your stock tachometer, it is waaaay off. They all are. Mine reads 7 grand when my Autometer says 6000.

03-25-2002, 01:54 PM	#1
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Max HP at what RPM???? My car is an entirely different animal since I installed the heads, intake, and FPR......It revs to 6500 easy........Where should I be shifting at . It feels like it pulls all the way to 6500rpms??? __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

03-25-2002, 01:59 PM	#2
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Going to the Dyno... I've got a similar setup, and I've got a date with a dyno this Wednesday at 3. I'll post the curve and we'll both figure out where to shift. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

03-25-2002, 02:16 PM	#3
mustang17 Registered Member Join Date: Sep 2000 Location: Concord, MA, USA Posts: 264	What cam do you have? 6500 seems high. I would think with a mild cam you would be more in the 5500 range. With the stock computer, you're not hitting the rev limiter? I'd like to see what the dyno says. __________________ 1995 GT Black- Edelbrock- 6037's,Intake, cam,70mm TB,75mm pro-m,Equal length headers,3.73's and all the bolt on's. SOLD 12/5/01 NEW! Mercedes-Benz SLK 230 Red/Black. Kleemann boost increase on the way!

03-25-2002, 03:22 PM	#5
mustang17 Registered Member Join Date: Sep 2000 Location: Concord, MA, USA Posts: 264	No, it's not just you, Jeb. Seems high for the cam, bottom end, and maybe the valve train. There has to be an error with the tact or something. __________________ 1995 GT Black- Edelbrock- 6037's,Intake, cam,70mm TB,75mm pro-m,Equal length headers,3.73's and all the bolt on's. SOLD 12/5/01 NEW! Mercedes-Benz SLK 230 Red/Black. Kleemann boost increase on the way!

03-25-2002, 04:36 PM	#6
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	???? My car does not have a rev limiter .....I dont know if the previous owner did something to it or what? I was using the stock tach but I though it must be off. I went home and hooked an aftermarket tach up and my tach shows to be dead on up to 4000 but then about 500rpms off from there up so my car still pulls up to 6000rpms instead of 6500. That still seems high to me. It appears I will have to shift at about 6000rpms. Oh yeah....I have the stock cam. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

03-25-2002, 02:47 PM	#4
Jeb_Bush_2000 Registered Member Join Date: Jul 2001 Location: Taxachusetts Posts: 374	Is it just me, or does that seem awfully high for a stock bottom-end?

03-25-2002, 05:08 PM	#7
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	the stock rev limiter is 6250RPM. So I'm sure your tach is just off and you arent quite there yet even though its reading 6500 With the stock cam, mine always ran the best at the track shifting it at like 5400 (on an autometer tach). And seeing how our combo's are pretty much the same, thats what I would reccomend for you too. good luck - Drew __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

03-25-2002, 05:22 PM	#8
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	I have the stock cam and it Pulls Very hard to 6200 I bet 5900-6100 is the Max HP on it I will get it on a dyno this year sometime. __________________ 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

03-25-2002, 08:00 PM	#9
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	I don't really see a problem with running the stock bottom end to 6500rpm. I'd be more concerned about the valvetrain. Wigged out E7's can flow up to about 220cfm with CNC jobs and bigger valves. With the stock cam, I'd expect best shift performance to be below 6000rpm. The stock tach can get really crazy up in the r's. I took mine to fuel cutoff to see how far the tach was off. I hit 7000rpm on the factory tach before the 6250rpm fuel cutoff kicked in.

03-25-2002, 11:17 PM	#10
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	You will never make peak power at 6000 RPM with a stock cam. My combo is a rebuilt 302 with an E-303 with 1.72 rockers, mildly ported TFS TW heads, Holley Systemax intake, 65 mm throttle body, 24 lb injectors, C&L 73 meter, and equal shorties. My peak power on the dyno was at 5800 RPM. Which means I should shift at approx. 6000 RPM for the best time slip. If you are reading your stock tachometer, it is waaaay off. They all are. Mine reads 7 grand when my Autometer says 6000.

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