waterplay

I am thinking hard about putting one on but want to hear who if anyone has on and what they think. The Tech Rep assured me that even though I have 10.4 compression I will be ok if I limit my boost to 6 pounds. With my present setup this will give me about 675hp – 740hp with the Vortech. What are your thoughts about this combo?

Guru_4_hire

What the heck.

With what kind of cam? what displacement? Also, from what people are saying on the turbo boards the L31 vortecs crack alot and are cast from a soft iron that may not hold up under the high pressures from blowers and turbos.

waterplay

383cid with good headwork. The naturally aspirated hp is around 550. Hot Rod Magazine made 551hp with a similar combo. I basically copied their recipe and had my builder do his magic and went with his additional recommendations. I do have better heads and more compression 9.6 to my 10.4. I told my builder that I wanted 550-600hp (mild motor for him). He assured that he easily made the mark. The 700hp that I listed is only a 35% increase if I did my math correct.
Check out this link http://www.compcams.com/Community/Ar...?ID=-603962390

Cam info:
Grind Number CS XR294HR-10
Description

Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.54 0.562
Duration At 0.006 Tappet Lift 294 300

Valve Timing At 0.006
Open Close
Intake 41 73
Exhaust 84 36

These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 242 248
Lobe Lift 0.36 0.375
Lobe Separation 110

Guru_4_hire

good deal. gives me hope for my project. I only want 650.

waterplay

And you want a twin turbo setup!!!! You will need to detune to go that low! A Streetable turbo setup should be close to 800hp. I talked to Banks and a company called Nelson racing ( I think Nelson was there name).

Guru_4_hire

You need to remember I am working on the cheap. I could easily make a 1000+hp engine. but the problem becomes reliability, and cost. driving fast isnt that great when your tranny is blowing up or something.

I figure at 16lbs of boost, or about twice whatever my engine makes NA will mean I need about 325hp from a low compression engine.

I already have my cam, its pretty mild 213/219 .461/.471 lift. So I am trying to maximize flow in the low lift numbers.

also I am trying to minimize cost.

so a 350hp low compression 8.25:1 or 8.5:1 engine will get me where I want to be considering I will be choking off the exhaust. so 650hp at like 5200 rpm will be a pretty good feat.

waterplay

I think you should easily hit your mark.

Guru_4_hire

I dont know look at the dyno graph of the XR264 cam on the Compcams website.

I think it will be difficult if I stay with low buck parts. I think 600 is a more likely target with such mild parts.

Z-man

If your goal is a street vehicle, don't forget that those hp figures occur at very high rpms.

Corey_68

Plus the rear end, tranny, and suspenion will also have to be modded to handle the added stress.

Many people think they can just add power without beefing up existing parts.

Best of luck, sounds like fun.

Guru_4_hire

I would also consider making your own plumbing and using the extreme velocity hat and the barry grant blowthrough carb, or modify a holley 4150. probably pick up a bunch more horsepower.

waterplay

You don’t think that the pressurized card enclosure is better? I have not done any research on either one. I am not sure that I would go with the Berry Grant carb though I am partial to the good old-fashioned Holley. What are the benefits and disadvantages of each (carb top and enclosure)? I am only entertaining this idea because I have a friendly grudge match against a WRX that runs high to mid 11s. I cant loose to this kid with rice! Any help and ideas would help.

Guru_4_hire

A holley can be modified relatively cheaply, Barry grant sells a carb that is already modified for blow through.

the EV hat is cheaper and has a smoother less restrictive delivery of air into the carb. the only benefit of the big box is that you wont have to modify your carb.

waterplay

Any idea of what that carb would sell for? I think the setup of the top hat would be much easer and look cleaner.

Guru_4_hire

the EV hat is 200 bucks and the barry grant carb is 532 bucks.

A modified holley could run you about 60 bucks more than what you can find a 4150 for on ebay.

Yellow73SB

I dont think you have 550 horse with a 540 intake and 560 exhaust with 10:1 compresion. But i guess im wrong.

I make 470 with a 355 with 11.56 to one with ported and polished heads and .550 lift cam with 236 duration. The 383 doesnt give much more horsepower just more torque.

Ive been thinking of getting one. Except i whould do it all custom like this guy i know (im not sure of the horse power but he doesnt have a roll cage in yet and he runs slicks and breaks them lose a the start and it Pulls the tire about 2 feet of the ground the whole track ). It whould cost me around 5 grand to do, not that bad and im only hoping for around 800. I think 800 should be scary fast

Ok im tired so please forgive me if i sound like a moron

comp

i think some have a cooler in there