Harrop Engineering. We have a very smart race engineer over here. A Mr Harrop. He supplies parts to the Aussie equivalent of NASCAR. Ours is called V8 supercar.

The above intake is for the LS1 I believe. Could be used on a C5 then I suppose.

 

No, Yes. lol

I like the looks of the FIRST INTAKE.

How does it actually perform ?

Street Drivability wise ?

IR or Delorto Carb-EFI systems are supposed to be super responsive on the street. What I am looking for exactly.

More important than peak power numbers.

Do they have a website to checkout ? FIRST EFI ?

 

http://forums.corvetteforum.com/c4-t...first-tpi.html

www.firstfuelinjection.com

 

You Aussies are real gearheads down there too I hear and read.

I have heard of Supercar Racing in Australia.

Why don't You get together with Mr. Harrop and develop a similar EFI system as you shown today for the GM TPI engine ?

Use it on YOUR 87 Roadster ?

If it really works great, I will BUY that system from YOU.

Be his business partner.............after all You are an engineer.

Work out the bugs that usually surface from a new Performance speed part to the public, before hand.

Test and Research and improve it with your Corvette and your knowledge.

 

Yes,

Clicked on, FIRST is an American Company?

Are you going to purchase a FIRST System Yourself?

 

Probably easier to do an LS1 conversion in the C4 than to start from scratch for a TPI setup.

 

There may be a used one for sale I hear (from the BBK thread) so it's a possibility.

 

I like going thru the catalog at www.kinsler.com Those ram tube setups look cool.

 

Go For It !

Buy it and try that Delorto Style FIRST EFI System out.

One aspect I remember from a True Individual Runner (IR) system, each throttle blade feeds that connecting cylinder alone with air or fuel alone.

So The throttle bore sizing is critical for the intended RPM operating range on the street.

Each Butterfly must flow correct amount of CFM's required for 1 cylinder only, same holds true for 4 , 6, 8, 10, or 12 cylinder engine.

In a carburator, or EFI system like are TPI engines, if a 48mm twin throttle body flows 625 CFM, it is only feeding one cylinder with air at a given time( V-8 engine fires every 90 degrees of crankshaft rotation).

So in a IR setup , EFI, if one cylinder requires 250CFM, then the total system airflow rated capacity would be 250cfm X 8cyl = 2,000CFM.

 

I'm sure they work well too.

 

The IR (ram tube) system has to be superior because it gives individual tunability per cylinder.

 

I agree with You 100 %.

Like to purchase a system like that FIRST I.R. EFI shown.

Maybe early next year in the winter.

Have too much going on right now to think of such a purchase for my Corvette and planned 410 engine swap.

Research some more on your own.

Then make the Purchase.

I like the looks and the performance potential that may be in that FIRST IR EFI.

 

I calculate for two cylinders at at time because there's some overlap.

 

Thanks for that. A lot of good reading there. Looks very promising also.

 

Keystring if you can get rid of that foam air cleaner its a fire waiting to happen, seriously. Even a 10" open element type is a huge improvememt they are dirt cheap.
You can use a drop base for more clearance, call Summit racing.

 

You want to read this article :

TEN TIMES THE TORQUE
http://www.calderone-online.com/c4/tpi.mht

and this threads :

http://forums.corvetteforum.com/c4-t...ombo-make.html

http://forums.corvetteforum.com/c4-t...ning-this.html


when i was considering my intake/head/cam upgrade i collected lots of information ...hope it helps :

Stock TPI (410hp, 500lb-ft)
Edelbrock High-Flo (431hp, 501lb-ft)
Extrude Hone base & LTR (451hp, 534lb-ft) ***
TPIS Big Mouth System (460hp, 534lb-ft)
ASM Siamesed Runners (464hp, 510lb-ft) ***
SLP T-Ram (466hp, 495lb-ft)
Accel SR (480hp, 506lb-ft) ***
Holley single plane (493hp, 480lb-ft)
HSR (501hp, 493lb-ft)
MR (505hp, 471lb-ft)





Performer RPM/750--323HP@5250/353TQ@4250... Ave-256HP/341TQ
RPM/Holley PJ TBI--333HP@5000/367TQ@4500... Ave-264HP/349TQ
Stock TPI----------296HP@4750/367TQ@3250... Ave-248HP/336TQ
ASM LTR (GM base)--328HP@4500/403TQ@4000... Ave-273HP/366TQ
Accel Super Ram----329HP@4750/378TQ@4000... Ave-260HP/347TQ
TPiS Miniram-------328HP@5250/355TQ@4500... Ave-257HP/341TQ




RPM ---- ASM ---- FIRST ---- MR
2500 ---- 183 ----- 175 ----- 175
2750 ---- 215 ----- 200 ----- 200
3000 ---- 242 ----- 235 ----- 220
3250 ---- 268 ----- 265 ----- 240
3500 ---- 300 ----- 295 ----- 268
3750 ---- 318 ----- 328 ----- 283
4000 ---- 332 ----- 350 ----- 300
4250 ---- 350 ----- 367 ----- 325
4500 ---- 358 ----- 375 ----- 348
4750 --- *360*----- 382 ----- 363
5000 ---- 358 ---- *387*----- 377
5250 ---- 350 ----- 374 ----- 387
5500 ---- 328 ----- 362 ---- *397*


Stock TPI
TPiS - Bigmouth and Semi-siamesed LTR
FIRST Injections

Stock TPI------ TPiS ---- FIRST
2000 - 112 ---- 114 ----- 114
2500 - 149 ---- 144 ----- 149
3000 - 187 ---- 178 ----- 194
3500 - 218 ---- 216 ----- 235
4000 - 240 ---- 239 ----- 258
4500 - 253 ---- 262 ----- 274
5000 - 236 ---- 252 ----- 262


RPM - FIRST - MiniRam - AZ Speed & Marine
2500 - 175 ---- 175 ----- 180
3000 - 237 ---- 222 ----- 238
3500 - 295 ---- 263 ----- 295
4000 - 350 ---- 300 ----- 325
4500 - 377 ---- 350 ----- 352
5000 - 388 ---- 375 ----- 350
5500 - 366 ---- 398 ----- 330

The FIRST made 443 TQ vs the Miniram's 395 TQ at 3500 rpm (+48)
The FIRST made 460 TQ vs the Miniram's 394 TQ at 4000 rpm (+66)

 

What is an ASM LTR?

 

Arizona Speed & Marine Long tube runner setup

 

Don't think I have seen that one. Any photos? Cost?

 

http://www.azspeed-marine.com/induction.html