Took our new build out this past weekend.. my wife's first time down the track with this new setup she did great..car performed good..needs a few little tweaks ... she couldn't even use the 2600 stall convertor to launch so she just rolled off the line...we have nitto 555rs there are getting replaced with a set of MT ET street SS drag radials that should help... the build is a 383 stroker fully forged, lpe219 cam by lingenfelter, first performance intake, built 700r4 2600 stall,s60 dana rear 3.54s all controlled by a holley hp efi system...

 

Nice! Those are very good times for an initial outing and not being able to stand on it out of the hole. Get some new ET Streets, put some heat in them, and I'll bet you'll grab some air - probably drop .15 - .2 in the quarter. Don't know what the temps were when you ran, but with the ET Streets and 15-20 degrees lower and you could see a 11-second run.

Did you have enough time to determine best shift-point? I know on mine with the 355, it felt like it wanted to be shifted at 6000/6000, but when on the track it ran best at 5800/5600 - but that was with a TH350.

 

Thanks it was a decent day 60 degrees out.. bought a set of MT ET street SS drag radials cant wait to put them on.. I think one problem was its shifting at the stock rpm I think we should shift at 5800 or so what do you think? And it was sucking oil in from the pcv up top..I'm putting in a catch can that should solve that problem.. but i.think the bigger one was the car short shifting I know you ran a 1st what did you shift at?

 

Watch "89 iroc z 383, first performance intake" on YouTube
Watch "89 iroc z 383,first performance intake" on YouTube
Watch "89 iroc z 383,first performance intake" on YouTube

 

No we didn't this is my wifes car her driving it she will shift it but I'd love to get it to shift higher without her shifting it...

So those runs were stock shift points on nitto 555rs that were not hooking...lol
I think it has more in it...

 

Engine specs?

 

383 stroker,lpe219 cam,first performance intake,113 d port heads,1.6 roller rockers, 36 lb injectors, 9.8 compression,built 700r4,s60 dana rear 3.54s, all controlled by a holley hp efi system.

 

Impressive et numbers. Was there any porting to the heads or intake or flow numbers?

 

The intake is right out of the box the heads were done by tpis they 250 cfm they had some nice work done to them..

I really think it has low 12s high 11s in it

 

You obviously have a really good combination. Your 113 D heads have 58cc chambers, that is small for a 383. What compression ratio are you running? Also, I would be interested in knowing what crank, rods and pistons you are using? Thanks

 

we are right around 9.8 compression it's a fully forged 4 bolt main motor

 

If you look back lingenfelter lpe383 used 113 heads also..

 

i have questions about the hollly ecm. im building a similar set up and i want to run some timing control. are you using that function? if so whats the set up?

 

What do you mean timing function? We use the holley dual sync distributor

 

.060” pistons? So its actually a 388?

 

I thought at 1st it was but when the shop pulled the heads to check everything over from the 1st shop that messed it up he measured the bore it was .030 so that was a typo

 

I'm looking forward to seeing what it will do with some sticky ET Streets and her playing around with the shift-points!

 

Us too think we are hitting the track this Saturday..I put in a catch can ..figured out how to data log..and she wants one more try on the nittos before we condemn them..she is going to go thru the water box to really heat them and I'm going to lower the air pressure to 18 psi and she is going to shift we shall see would love to get this to run a 11.9x I think that would be pretty impressive for the mods.

 

Here is a picture of her launching it.

 

Get you some skinnies for the front and take off the sway bar (if not already) and that'll help you move toward that goal. I haven't run any Nitto DRs, but I couldn't hook the 355 with the FIRST on a set of ET Streets unless I did a John Force burnout.

 

This still has the sway bar attached.. my wife doesn't like skinnes she wants it on stock rims..so it's going to be tough to reach our goal Im thinking its also a full weight car still...

 

So, I'm thinking instead of the tag saying HERZ2, you might want to drop that 2 off there.

Sorry, couldn't resist. I actually built the IROC with the FIRST on it for the wife so she could have a car to haul HER dog around and race it when I took my SS to the track. I just threw some parts at it that were laying around the shop and didn't really didn't expect it to run as quick as it did. She drove it a good bit the first few weeks of it running and the first time at the track, she did great doing the burnout - too good.

She had made a number of passes with me (mine would raise a little and carry the tires 10-15 feet) and I told her it was possible the IROC could grab air for a split second. Even with the ride-alongs, me telling her what to expect, and what NOT to do if it happened, she caught a little air and still ended up moving the steering wheel. When the weight got back on the tires it shot to the right a little, she popped off the gas and slammed on the brakes. Once she got it moving again, she drove like 10mph to the 1/8th mile turn off. When she finally got back to the pits, she said that she would never get back in that THING again. I though she would get over it, but she was true to her word and it ended up being MINEZ - lol.

I can laugh about it now, but I was POed for a while. I did get what I wanted out of the car when I sold, but I sure did like jumping in it to run to the grocery store a lot better than the Tahoe that replaced it - lol

 

She actually has 2 a 91 z28 350 tpi with an old school paxton on it..that license plate reads itzherz this plate came a few years after so she made it herz2 lol I have my own toys I race..

Think were hitting the track Saturday hopefully it goes a better ET.. I'd love to see a high 11 out if it...

Did you like the first performance intake? We had a few TB issues with this one I think Its better now we got a new TB for it seems better.

 

see lol

 

Ahhh, makes sense now!

Yes, I really liked the FIRST. The pass she tried to make was with the original heavily ported TPI/SLP combo. I replaced that with a StealthRam and while it helped the ETs at the track, I really missed that midrange rush and throttle response from the long runners. I ended up practically stealing one of the original AirSensors (FIRST) off eBay that the guy bolted on an engine and never ran - it was basically new It even included all the original AirSensors electronics, which is still boxed up. It gave back 95% of the throttle response and ended up running near identical times as the StealthRam. I liked the intake so much that when I made the decision to sell the car, I put the StealthRam back on it.

I never had a bit of trouble others have reported about the throttle body. Well,,, I did have to use a different spring for the throttle though - the stock one was too weak to properly seat the throttle blade. Other than that, no idle or drivability issues at all.

If you can get a full throttle launch (no feathering) ETs are definitely going to improve. I'm thinking you have a really good shot at high-11s removing the sway bar and running some skinnies. I bought the wheels and tires off a buddy's Malibu and used them when I raced the IROC - everyday driving was a set of 17's with regular Nitto 555s.

 

Maybe I should try a different spring maybe thats the issue never thought of that...hmmmm

I really dont see anyone using the first..no ETs no dynos nothing...

You will laugh this is an old air sensors intake also we found this at a swap meet like 9 years ago never knew what it was finally found some info call Ken at 1st he was send pics of the intake we did he was like send it to me let me go over it..the intake was in horrible shape so we did he totally restored it for us.. if you go on his website our intake is the one he says we do full restorations on..you'll see before and after pictures he is a great guy very nice to deal with..I want this car to make some great passes to show people what the intake is capable of !!! Like I said you dont see them..

I hope your right high 11s would be pretty damn impressive on a mild 383 build with a set if old school 113 heads..lpe219 cam and a First performance intake...

 

Bet the guy in the new Challenger was screaming NOOOOOO!!!! all the way to the finish line. LOL! Especially after that ridiculous smoke show in the burnout box.

 

That was funny I was laughing my *** off...

 

from lingenfelter back in the day. 440 should be 350-60’s whp Capable i would think. Once you tune yours some and shift alittle higher it may show it

some of the corvette guys running this combo are well into 11’s

 

Weird it states a 219 cam but that's not the specs of a 219 cam ours are 560 560 lift 219 219 at .050 and 112 lobe separation 280 280 at .006 that cam they listed sounds more like the lpe211

I think our car weight is hurting it to get into the 11s the vette is definitely lighter by a good hundred lbs no?

 

Lpe 219 has changed over the years. I do believe .560” was with 1.6 rocker. I think that was a comp magnum lobe or similar.

ofcourse it may be a typo as well

vette should be touch lighter and perhaps abit more aerodynamic

 

Next time out i would try shifting 5200, 5500, 5800, 6200 if you get 4 passes in

 

We are going tomorrow I'll tell her to try that see what it does. I'll post results

 

Definitely log it lol that will be huge to know whats goin on. May want an adjustment on fueling, see how good your tables are. I dont wanna see more than 2-3% correction on my wideband fueling

 

Im going to be data logging I'll record it and post up some results..I'm not 100% sure what I'm looking at but I can show what its doing if someone knows what there looking at.

 

X2

And remember, going through the water box with treaded tires can be a disaster. Even with the old school ET Streets (bias slick with no tread to speak of) I would go around the water box and back into it. I've experienced some interesting launches where driving through the box has loaded up the front tires with water and left it precisely where my rear tires are going to be.

 

100% agree told her to back into the water box she knows ...lol

 

I was reading your other post about your FIRST 383mbuild. Who made your wiring harness for your Holley HP EFI install? How hard was it to install the wiring harness and where did you mount your Holley HP EFI ECM? I am thinking about going the same route with my FIRST 383 build.

 

The holley computer was mounted in the stock location cant even tell its there..as for the wiring harness efi connection made it it's a plug and play the stock wiring harness is gone this plugs right into the bulk head on the firewall everything foward is new ever wire..new AC wires,fans,washer pump,windshield wiper motor you name it all new...as far as installation the shop that did our car installed it..if you have other questions I'll be glad to help you as much as can.

 

I appreciate the offer. I will definitely take you up on that when it comes time to install the wiring harness and tuning. I have been out of the car scene for a while and want get my '88 GTA running again. I have lofty goals and hope to get close to the 600hp range with my FIRST intake.

 

I have no idea if a first would support 600 hp NA or you going power adder also?

 

I am going NA. Like yours, my intake is an old Air Sensors version. However, I am seriously modifying the intake including: siamesing and welding the runners, a ported and extrude honed lower, modifying and welding the plenum and a ported throttle body. I am flowing each section as I complete them. So far have finished throttle body, which is now 77.2 mm and flows 1138 cfm and the base flows 326 cfm on the worst port and 339 cfm on the best port I hope to get the full intake to flow around 320 cfm. I am running a solid roller 245@.050 intake and 255@.050 on the exhaust and the AFR 195cc competition heads. We will see, but I hope to get close.

 

Here is my throttle body

 

400 cubes and that top end with afr220 may get there. 339 cfm base is no good for a 280 cfm 195 head. 77mm throttle is small too imo. 90mm is typically the size for 550+ hp in the ls world, same would apply to the first if he has a bigger unit available

 

Nope that's about the biggest the TB will go he does not make anything bigger I was told by the shop that did ours you could potentially make an LS TB fit tho with an apaptor plate.

 

I have the AFR 195 competition ported ported heads. I had them independently flow tested and they 308 cfm at .600 lift. Since my throttle body flows over 1100 cfm,, from the flow calculators I have used, that is way more cfm than any 383 should need.

 

Ken ported one for us it was 76mm i took it off and put the stock 71mm back on car drives way better we couldnt not get the idle right with the bigger TB

 

Did you have to change the TB blade to increase the size?

 

Making an honest 600 from a 383 is a tall order and those heads would take a real serious race engine to get there
it has been done tho, joe sherman claimed to mAke 615 on the regular 195 heads but i am thinking he touched the heads up some. He usually does

383ci
11:1 compression
259° @ 0.050" roller cam, 106° LSA
AFR 195 heads (new design - out of the box)
850 BG carb
Super Victor intake
91 octane pump fuel

615 HP @ 6700 RPM, 528 lbs/ft torque @ 5200 RPM

notice the rpm peak, single plane intake. You wont get there with the tpi but it can still make impressive power imo

 

I read that article and he says they used the AFR Eliminator 195cc heads that flow 280cfm because the competition ported 195cc heads were not available at the time that engine was built.

Here is a teaser on what I am doing with my runners. Still have a lot of work to go.