1987IROC350

Who else has installed an all new crate engine? Did you go carb. or did you keep TPI?

I'm just wondering what setups are out there in 3rd gens.

I went with the Scoggin Dickey Vortec TPI engine and a rebuilt 700R4. The hp and tq both peak at 4200RPM's and are 357hp 416 lb/ft. I have not gone to the track with it but it feels pretty strong. I'm afraid to push it too hard off the line as the rear end is all stock.

I guess my next step is the get a Ford 9" rear. Any idea of what year is best? Would the newer 8.8" fit?

Marc 85Z28

The 9 bolt is more than strong enough for what you need. Don't be afraid to give it a little punishment.

The Ford 8.8" is a waste of time, and the 9" is overkill for you. Remember, you have torque arm rear suspension so you cannot simply swap another rear in.

1987IROC350

But I could put a Chevy 12 Bolt in if I need to? I want to have a plan before I break, ha ha. Of course if I remember correctly ring-pinion.com has every part I need to just rebuild my current BW 9 bolt. I'll check.

EDIT: Yep all here http://www.ringpinion.com/PartCats.a...RWD&DiffID=205

Marc 85Z28

You can put in a 9", Dana 44 (if you can find one), Dana 60, or 12 bolt.

Other than the Dana 44 which is super rare, none of them bolt in. You're best bet is the aftermarket for those, and they start around $2300 and go up over $3500 depending upon options.

Again, the 9 bolt is strong.

BigBadLou

That sounds like a sweet setup, good choice to stay with TPI, you got plenty of power but will still retain good economy. Speaking of which, what's your highway mileage? (assuming you can keep your foot out of it )

Got a dyno sheet by any chance? I have a similar setup (though I doubt I'm pushing as good numbers as you are with my home-brew torque monster) and was wondering how fast the power drops off after 4200rpm. I want to put mine on the dyno as well and would like to know what to expect out of the hp/torque curve.

Lou

1987IROC350

BigBadLou I have not dynoed the car. I've actually only driven the car about 1500 gentle miles since I had the motor installed. Which I think was 3 years ago.

The motor called for 30# injectors and I only installed 24# due to a calculation gone wrong. I'm going to have to get them installed and then have the computer reflashed before I push it hard and dyno it.

And I stayed with the TPI cause I like the way it looks. I know if I had gone with a good carb/intake combo I'd have more power beyond where the TPI dies. But hey, it looks good at shows.

OK Marc good news. I thought the 9 bolt was pretty strong but I guess I just needed to hear it. Thanks again.

BigBadLou

I see why you're babying it, small injectors aren't fun.
According to my calculations, though, you might need 32 lb/hr injectors or larger to support 360 horses (at stock fuel pressure). So double check your calculations before you buy/install new injectors. Increasing fuel pressure to 51 psi would be sufficient, though, to overcome the missing 2 lb/hr.

And I noticed you also have an '03 Mach 1? Sweet!

ws6transam

FWIW, I run Accel 30# injectors in a TPIS miniram at a shade under 40 PSI, and dyno 400 RWHP. My max duty cycle is 85%, meaning there is still headroom left in these injectors. A series of eight 30# injectors are mathematically capable of flowing enough fuel to support 475 flywheel HP.

Since you are running a tuned port injector setup that is effective at RPM less than 6000, I respectfully disagree with Lou, and think you will be better served sticking to a smaller fuel injector solenoid that is no larger than 30#. It'll help keep your fuel metering nice and crisp at low RPM for emissions and throttle response.

BigBadLou

ws6transam, thanks for the information. I just have a dinky injector flow rate calculator from online so I cannot speak for its precision or authenticity. What calculator do you use? If mine is wrong, I'd love to replace it and avoid spreading misinformation.

Thanks!
Lou

Marc 85Z28

**** this **** and these cars

ws6transam

Don't hold back, tell us what you really think, Marc!

Lou, I designed my engine in 2001, and did the calculations back then. My information, as I recall, comes from HPBooks's Fuel Injection manual, plus corroborating information from Lingenfelter, and also from the DIY_EFI mailing list. I started doing the actual EFI design-work for retrofitting EFI onto my '84 back in 1996.

So, from memory,

Injector sizing, as a ballpark estimate, can be calculated from knowing your fuel pressure, maximum duty cycle, flywheel (brake) horsepower, and Brake-specific fuel consumption ratio. A good naturally aspirated engine with tuned runners will have a BSFC of 0.45 to 0.55.

So, for instance, if fuel pressure is set to the reference pressure of 43 PSI, if your flywheel HP is 375HP, your BSFC is 0.5, your duty cycle is 0.85, then your injector calculation is as follows:
Injector sizing = [(375HP * BSFC 0.5)/ (8 injectors * 0.85 dutycycle)] * square root (Reference pressure(43 psi)/ measured fuel pressure(43 psi))

So, 375 flywheel HP yields an optimum injector sizing of 27 lb using the above formula.

We can back out the equation as well, to determine maximum HP for a specific injector size. In this case, a 30 lb injector, when using a BSFC of 0.5, theoretically should be able to carry a 408 HP load. In practice though, BSFC is never quite 0.5. In my case, I've got 396 rear-wheel HP, which is probably about 460 brake HP, and it's being carried by a 30 lb injector, while maintaining a 13.2:1 air fuel ratio at peak power. Therefore my BSFC for my particular engine combination is probably closer to 0.45

BigBadLou

ws6transam, thanks for the clarification, I know exactly where I made a mistake (d'oh). I left the "stock L98 BSFC" in the calculation (got a nice Excel spreadsheet).

If we assume that 1987IROC350's crate engine has BSFC of 0.45, his 24# injectors should then support 360 horses at stock fuel pressure and 85% DC max. If the BSFC is just a little higher, it would be probably easier to just bump the FP a pound or two.

I too am estimating my BSFC at 0.45 but a dyno run with AFR will show the real numbers. Hopefully soon.

Marc 85Z28

My wife was mad at me for not cleaning the basement late last night. I must have left my account open...

BigBadLou

Hehe, that's what I thought, a hijack. Yeah, lock your computer when you walk away. Wives and kids love to make daddies look bad on them Internets. Our division director at work does that!!

1987IROC350

Yea Marc I was like wow. Anyway, funny wife you have there.

So worst case I might be running a little small on injectors. I'll still put the 30# in and reprogram the chip just so I'm sure to run better. Also adj. fuel pressure again.

Thanks for the deep posts. I appreciate it.

So any other crate combo's out there? 502's 454's?