speed density

racerx0071 · 09-04-2003, 04:29 PM

guys,

I need to know if I can keep my speed density with the following mods...

gt40 hds, explorer intake, 1.7 roller rockers, shorty headers h pipe (no cats), flowmaster exhaust, I do have an adjustable fuel pressure regulator and I figure I will have to play with the tune a bit , but will it work ok , or do I have to go mass airflow?

thanks

canukracer · 09-04-2003, 10:30 PM

I would say yes, the only thing i'm wondering about is the 1.7 rockers hurting the vaccum thus the the map sensor reading> but it's not that much more lift, my 86 gt has the same stuff but no 1.7 rockers, if it idles crappy change the rockers back> 86 pistons have no valve releifs

drtbiker · 09-04-2003, 11:22 PM

shouldnt be a problem at all just set the fuel pressure around 38psi and u'll be set....
lata

88workcar · 09-05-2003, 06:17 AM

SPEED DENSITY

You can do what ever you want. That is and old myth, Crap, bull, what ever you call it. If your car is an 86, then you will have P to V issues but thats it.

Dark_5.0 · 09-05-2003, 09:14 AM

I still got speed density and have no problems.

Here a tip though with an 86 with un-notched piston you can run trick flow twisted wedge heads and a mild cam.

The trick flows dont use the stock valve reliefs.

_________________________________________________

With what you listed even with the 1.7's I think it will all work. Just check all your clearances.

09-04-2003, 04:29 PM	#1
racerx0071 Registered Member Join Date: Jan 2003 Posts: 7	speed density guys, I need to know if I can keep my speed density with the following mods... gt40 hds, explorer intake, 1.7 roller rockers, shorty headers h pipe (no cats), flowmaster exhaust, I do have an adjustable fuel pressure regulator and I figure I will have to play with the tune a bit , but will it work ok , or do I have to go mass airflow? thanks

09-04-2003, 11:22 PM	#3
drtbiker Registered Member Join Date: Jan 2002 Location: Mt. Prospect,IL Posts: 474	shouldnt be a problem at all just set the fuel pressure around 38psi and u'll be set.... lata __________________ 87-ford-mustang-SOLD! mods: 3:73's, off road h-pipe, b303 cam in gt- 40 motor w/ Power Plus intake, edelbrock 70mm tb & egr spacer, 72mm C&L, bbk long tubes, tremec tranny, centerforce dual friction clutch, upr and lwr CA's 255lph FP and soon more to come.... when i have money again SOME ADVICE Don't do burn outs in reverse it is very expensive New times with dead hook on dr's 13.27@103 with 2.0 60 foots w/100lb system Fastest time to date: 12.8@113

09-05-2003, 06:17 AM	#4
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	SPEED DENSITY You can do what ever you want. That is and old myth, Crap, bull, what ever you call it. If your car is an 86, then you will have P to V issues but thats it. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-05-2003, 09:14 AM	#5
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	I still got speed density and have no problems. Here a tip though with an 86 with un-notched piston you can run trick flow twisted wedge heads and a mild cam. The trick flows dont use the stock valve reliefs. _________________________________________________ With what you listed even with the 1.7's I think it will all work. Just check all your clearances. __________________ 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

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09-04-2003, 10:30 PM	#2
canukracer Registered Member Join Date: Jul 2003 Location: alberta canada Posts: 108	I would say yes, the only thing i'm wondering about is the 1.7 rockers hurting the vaccum thus the the map sensor reading> but it's not that much more lift, my 86 gt has the same stuff but no 1.7 rockers, if it idles crappy change the rockers back> 86 pistons have no valve releifs