fox intake help

[sdun]

'90 GT built in '94 then drove 4k miles. The car has less than 50k miles. 347 with ede. rpm heads, Lazer cam that sounds about the size of an E cam. Shitty Paxton making around 5 pounds. Had some crappy shorties with stock H pipe and 2chamber cat back. We put long tubes and off road x on it today. It's got a stock intake and t-body. What intake and injector? TFS r 75mm? rpm2? 30lb'ers? Not like the days when you put either cobra or gt-40 on it because that's all that there was.

[slowturbocar]

I would do the RPM2 and some 42 or 60lb injectors/ and a lighting meter then get it tuned....

[BlueCoupeRedVert]

The SN series Paxton is useless on a modded motor.. It can't move enough air to Boost an aftermarket headed 347.. Sell it to guy with a Stock motor.. Buy a Vortech or a procharger

[mk5.0]

Systemax or rpm 2, 42lb

[Payingcustomer]

fox intake help

Stock throttle body, parts store maf (adapter needed I think it's like $40) from 94/95 GT. As far as the intake I was going to say systemax or another similar intake that would be used on a motor that is making power past 6k rpm. But then I re-read the part about the cam being similar to an E cam. Do you think it's still pulling at 6k? Or do you think it's taking a nose dive past 5,500? If it's the latter then I'd get a TFS "street burner" or something similar. An intake meant for high rpm applications being used on a low rpm engine isn't all that great.
Injectors- 60#
What fuel pump do you have?
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[sdun]

Haven't looked at the fuel pump yet. Will do it when we do intake and injectors. I think we are going to go with TFS 75mm, 90 is too big for the cam. On that note what is the best 75mm tb now? Blower is crap, we'll see how much boost it makes when we are done with everything else. If it gets replaced it won't be with another blower, it'll get a 76mm. Bottom line is the stock block won't go more that 550 before it eats itself.

[Z06killinsbf]

My old combo was Gt40/Cobra intake, TW heads, stock cam, 75mm BBK TB, 60lb injectors, lightning maf, 255lph pump and a V2 S-Trim on 14psi. It made 460 at the wheels on a conservative tune. The explorer style GT40 intake is almost too cheap to pass up.

[Sleeper]

Systemax.

[JETFAST]

I got 520 to the ground out of a set up like that with a btm and fmu back in the day. 95 cobra. I would put 55-80's in it, a slot style meter. If you want the tq leave the long runner plenum on it. systemax, tfsr. if you are looking for HP bread box, style upper. Had a ported and polished downs box, gt40's lower and heads, worked real nicely. Trickflow stage 2 cam. power pipe, pro-m, 42's, a1000 on the 95. no chip then. That car got me started with tuning chips for them, because i couldn't find anyone else that could at the time.

[Broncojohnny]

The TFS R intake and 75mm TB would be fine. The bigger question is what mass air meter is on it? Get the biggest mass air meter you can, the 90mm Lightning meter is cheap and you are going to get a tune any way it sounds like.

For injectors, unless this is a cheapo junkyard type project, forget the old style injectors and get the newer style injectors with the USCAR connectors, they are light years ahead of the old stuff when it comes to low speed control. So much so that many people just use the 60lb/hr and 80lb/hr ones in lightly modded cars. They aren't expensive either, you can get a new set of FMS 47 lbers for $275 or so.

[black50]

The ole ball drive Paxton blower

What kind of HP will that thing support? I would guess not much

[Payingcustomer]

The TFS R intake and 75mm TB would be fine. The bigger question is what mass air meter is on it? Get the biggest mass air meter you can, the 90mm Lightning meter is cheap and you are going to get a tune any way it sounds like.



For injectors, unless this is a cheapo junkyard type project, forget the old style injectors and get the newer style injectors with the USCAR connectors, they are light years ahead of the old stuff when it comes to low speed control. So much so that many people just use the 60lb/hr and 80lb/hr ones in lightly modded cars. They aren't expensive either, you can get a new set of FMS 47 lbers for $275 or so.

So in laymen's terms the USCAR can be "fine tuned" by a turner more so than the others?


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[JETFAST]

There is better control over them at lower rpm and voltage with a new stlye 55, then say an old style fat body single pentle 42. they are pretty sloppy down low, not as much precision control over the flow and atomization of the fuel at low rpm, and low voltage. plunger style pentle puts out huge droplets of fuel, while a disc type have 4 holes or better help break up the fuel. This provides more controllable at low resolution because of the winding and disc, not being as heavy to move, less weight, less amps, unlike an old big body.

A lighting maf sesnsor is far from what i consider ideal these days.

A slot style digital sensor, ford uses now, is what i try to use instead of the analog hot wire maf. but the analog meters work too, just like the old big body injectors. like the difference with injectors, a LMAF does not have enough resolution for the given diameter of the housing being used, and the meter is very easy to peg out for this very reason.

Same diameter maf housing in question, a slot meter will calculate higher air flow threw the housing, then the hot wire can calculate in the same diameter housing.

I don't like to peg the meter and run everything based of the last cell in the maf curve. i also dont like tuning in the last cell in the corner of the fuel and timing maps.

So I rescale to give the computer room to calculate for load adjustments up to 200+%, instead of 100%. It's really easy to peg 100% load on a other wise stock, lightly modified combination. So you make hardware adjustments, and software adjustments to allow for calculations less than or greater than 100% It's all about the scale of calculation. You scale the cubic inch to the injectors, meter, fuel & timing tables, ect. to operate somewhere in the middle of the range of the intended atmosphere being calculated and used. This gives the computer far greater resolution of the calculated adjustments, timing, lean or rich, CL & OL, 0-200% load.

The new found resolution in the hardware and software adjustments, ultimately leads to better control over every aspect of the tune up, because you have room to move around in the maf curve and the maps. this provides the computer greater control over the spectrum of the operation range of the engine and atmosphere it attempts to process.

[Z06killinsbf]

Or go stand alone and use a MAP sensor, delete the MAF all together. The money spent on a stand alone would be used for an aftermarket chip and MAF anyways.

[Broncojohnny]

Or go stand alone and use a MAP sensor, delete the MAF all together. The money spent on a stand alone would be used for an aftermarket chip and MAF anyways.

This is great advice but can get pricey.

Definitely listen to Jet on the mass air meters if you use one.

A lot of this comes down to budget. As someone who is racing a piece of shit T-bird in junkyard wars, I can relate.