Need help tuning 1988 GT 347 engine with procharger D1-SC strapped on!

dynoman · 01-15-2003

I built a nice 347 w/race ported GT40 heads, GT40 intake, Forged Pistons & crank, 75mm Tbody & mass air meter, 24lb injectors,190 ltr intake pump, and 1.6 roller rocker. Compcam is .255/266 lift, 224/232 dur, 114 ctr line. lots of other goodies.
I just ordered a D1 procharger for 12 lbs of boost. I have Diablo chip. I plan on putting 42lb injectors & PRO-M Univermeter, Aeromotive street fuel rail kit and MSD Boost Timing Retard module.
Everyone says I am going to have idling problems because the injectors are too big. They also say the computer is too slow. Has anyone put this type of combo together with good success ideling and running on the street. This is an AWSOME street car. I want to make about 550 -600 hp.

any tips and tricks would be well appreciated.

Dynoman

nestle_2000 · 01-15-2003

I'm not really familiar with the speed density car. I'm assuming are yours is? My buddy has 38 pound injectors on his car. He's not having any idling problems whatsoever. I don't think you'll have a problem. You might want to get into a dyno tune with a custom burnt chip though.

dynoman · 01-15-2003

I have converted the car to a mass Air car already and running a Pro-M 75mm sensor. I am going to go to a Pro-M Univermeter (one of those round ones that don't have a sensor in the middle to restrict air). I do have a Diabo chip which I will get burned but I hope it works. did you have a chip installed, was it custom burned?

nestle_2000 · 01-15-2003

No, I'm going to get the Tweecer. www.tweecer.com. It's a computer controlled unit that has real time data logging etc. It's a pretty cool looking piece that will help me map my fuel curve, timing, etc etc. It'll let me update my profile as I put more stuff on my car. Sounds like you got a real good setup happening. Since you've switched over to the MAF, I don't see you having too many problems. Those are mighty big injectors though...they should work just fine. I think you could go a step down, however...the bigger ones will allow you to add something else if need be (ie. bigger blower, nitrous, etc).

nestle_2000 · 01-15-2003

Oh one more thing, you might want to upgrade your fuel pump. La Rocca Performance suggested that I go with a dual fuel pump. One intank, and a piggy back inline setup. You can't have too much fuel!

dynoman · 02-27-2003

OK, Its up. got the D1 on the car with just the 24lb injectors. This thing makes mad power. I had some problems getting the FMU working correctly but now have that fixed. Right now I just want to make sure I am not having any big problems so I haven't switched to the 42lb injectors yet. I have a flat spot when the car starts to make about 3-5 lbs of boost and it seems to fall over on it's face. Especially if I try to step into it too hard. If I just role into it is seems to get past that point then starts making BIIIIIIIIIIIIGGGGGGGGGGG boost. The power comes on like Gangbusters. boys this is a whole different world. ATI D1's Rock. I had them setup this thing for 12lbs of boost at 6200 RPM and they hit it right on the money. the only problem is that the car now want to rev way past the 6200 RPM but I'm a little worried I may be too lean right now. Any help with getting past this flat spot would be great. tips, or tunning tricks would be great.

PS. See first post for engine details.

Blu50Stang · 02-27-2003

Find a place that does dyno tuning and chip burning. I went to R.A.C.E. Systems, THE place to go around here, for a chip and dyno tune. Look around www.racesystems.com. They might have something you like.

Crash! · 03-03-2003

Here is another that is familiar with the Univer and 42s... Uses the BLACK Diablo chip.

www.rffperformance.com

Crash! · 03-27-2003

Experience tells me you have made a good choice on the upgrades, especially considering the engine specs. You need well over 30#ers.

We have noticed the hesitation you describe under two conditions. Overrich, and retarded timing.

The Univer MAF and 42s is a good combination. We have noticed rolling idle concerns with 12 PSI and 42s. Adjusting the bypass usually solves this problem (tuning will most likely not cure this). On EEC V, we also put the charge temp sensor in front of the throttle body so the PCM will pull timing when necessary.

My experience is validated on the EEC V MOD motors, but there is always an engine underneath. Hope this helps you.

dynoman · 03-27-2003

Thanks Crash:
I go the 42lb injectors, Aeromotive Street Fuel Rail kit and Univer meter on now and had diablo burn me a chip with all the specs I gave them and this car runs great with just as good of an idle as it did with the 24lbs. I think it is a little rich but that's Ok for now. Turned up the bypass screw 1 turn and fixed that rolling idle problem. I might give that charge temp location change a try and see what happens.

By the way guys, Now this thing want's to keep pulling hard well beyond 6200 RPM now , so I put a 6800 RPM rev limiter to see what it would do. late at night in the cool AZ night air, I stepped on 3rd gear (1 & 2nd won't stick to the ground). As I tried to concentrate on both the road and the boost guage, I saw 15lb's of boost at 6500 RMP in 3rd gear.

The car is unreal. Mad boost and crazy streetable power. The beauty of it is, I can drive it as a daily driver, 40 miles one way back and forth to work.

ATI Procharger ROCKS.

Thanks to all for the help.

One_Quik_Pony · 04-01-2003

Dynoman-
I have a similiar setup to yours, but I'm running the ATI P600B, similiar cam, twisted wedge heads...anyway, just wondering...How are your brakes?

I have no brakes when car is cold, due to low vacuum. Have you ever measured the vacuum on your setup? I read about 8" at idle.

One more thing, I am still using the stock computer. I want to get a chip burned, preferrably with a dyno, but the only one I know of in Phoenix, I dont trust! Can you recommend the Diablo chip?

Hey, ever been to the pavillions? 40 miles one way to work? I thought 32 was bad...especially at $2.20 a gallon...BS!

Thanks!
Kevin

Fordgazm · 04-01-2003

Quote:

Originally posted by One_Quik_Pony
Dynoman-
I have a similiar setup to yours, but I'm running the ATI P600B, similiar cam, twisted wedge heads...anyway, just wondering...How are your brakes?

I have no brakes when car is cold, due to low vacuum. Have you ever measured the vacuum on your setup? I read about 8" at idle.

One more thing, I am still using the stock computer. I want to get a chip burned, preferrably with a dyno, but the only one I know of in Phoenix, I dont trust! Can you recommend the Diablo chip?

Hey, ever been to the pavillions? 40 miles one way to work? I thought 32 was bad...especially at $2.20 a gallon...BS!

Thanks!
Kevin

Get a vaccum reservoir and it will/should fix your brakes .

dynoman · 04-03-2003

One_quik_Pony:
I don't have any problems with the Brakes. I have about 12-15 lbs of vaccum at idle and it will go up to about 20lb when crusing or decelleration. My cam is not a huge cam. 255/266 lift with 114 dur.

Are you running an ATI D1?

so far I have had really good luck with my diablo chip. I had the guys at All Mustang burn it for me. If you are interested I am thinking about selling it and getting something mor probrammable. I purchased it with enough hours so programming won't cost anything additional.

I have been to the pavilions, I might go out there this saturday if I get a new belt from ATI. (Sucks) look for a blue convertable with a license plate that says "extream"

Dynoman

One_Quik_Pony · 04-07-2003

AAArrrggh! I didn't get back to you in time. 12-15 in/hg at idle is what I used to have before the blower/fuel system upgrade. 255/266 lift? Are you sure? Thats only about half of the lift on my cam, from what I recall I have 514 lift plus a 1.7 rocker. Who makes the cam? By the way, is it a 6 or 8 rib belt? or cog? I bought my blower belt at Make Model & Year, they have almost any size belt. Not sure about cog belts, which they say are just equipment timing belts.

I am running the P600B, with the race impeller and bearing upgrade. It has the huge 3-row intercooler up front.

Did they burn the chip on a dyno? I don't remember seeing one the last time I was there, be cool if they have one! What does programming it involve? I have dealt with Tom for years, since they were on the west side.

I would have made the trek to the pavillions last weekend, but right now I have a Tremec spread out over the garage floor. I had to change second, third gears, blocker rings, and a synchro, again; almost $400. Can't really afford to go fast anymore, but it's so much fun!

dynoman · 04-07-2003

man did I fat finger that one. the cam is 555/566 lift. 224/232 duration. (oops) wouldn't go to fast with 255/266. It is a comp cams grind.

I have the 12rib belt it's about 3 inches wide. that's what makes it almost impossable to find. I am running the D1-SC with 3core intercooler. boost comes on fast and strong.

all mustang doesn't have a dyno, I just gave them very detailed specs on the car, they gave them to diablo and diablo emails them a program and they burn it there. it doesn't take that long.