blown4now

Well, I think I've found a car, so I plan on driving to STL in a couple weeks to check it out. Solid body, nice new paint 90 Z28. The LSX block and LS7 intake should be around end of the month, and then it'll all go to my engine builder who will start stuffing it full of parts. But before all this happens....

I plan on running a street car as most of you know. But, I'm looking to make 1000rwhp on race gas. Do you all think the 427 with LS7 heads is going to be to big of a motor/flow too well for the S88 to keep up with? I don't really wanna go with a bigger turbo cause of spool time, but I would consider dropping the motor size. Also, for a street application, what would you recommend for cam size? I'm planning on keeping LSA around 117-118 to keep dynamic compression down, and help with keeping this thing alive longer. What specs would you all recommend? Keep in mind I want something streetable. You guys have already been a huge help, keep it coming please!

Slowhawk

iTrader: (12)

For just 1000hp you can just do a truck block 408ci with the 88mm turbo.Should be able to hit 900rwhp on pump gas easilly enough then add meth or race gas to go over 1krwhp.
Cam size can be high 220's to low 230's which give 100% streetability and enough to hit the power level.

engineermike

Again, an S88 on an LS7 is WAY overkill for 1000 rwhp. Alot more has been made with alot less.

Dynamic compression has as much to do with duration as LSA. Just how choppy of an idle are you willing to put up with? Do you want a stock idle? Slight chop? Etc. . . Some people are willing to put up with alot more than others in a "street application." I, personally, want my daily driver to have a glass smooth idle, but others' opinions are much different.

Mike

blown4now

Well it won't be near a daily driver, so I'm definitely ok with some chop. I just want something that is not gonna give me off throttle issues. Ya know, I don't wanna lose so much vacuum at idle that my break booster won't hold pressure!

In all seriousness, I know the LSX block with LS7 components is overkill...but that's kinda the point with this thing. I'm building it so that, if I absolutely want to, I can keep the motor, and swap out a very large turbo and an auto for an all out *** hauler. This is the reasoning behind the "overkill" on the engine. Kinda the wow factor, the ability to go beyond my goals if I get the itch, that sorta thing. I only wanna build this thing once, and maybe swap a turbo or something in the future, so I'm gonna build just about the best engine I can for this thing. It's not exactly a budget build car. I'm going for the speed, the wow factor, and most importantly to me, knowing that I can get in the car, enjoy the hell out of driving it, and not worry about "pushing it too far" with the engine.

kill_machine85

iTrader: (4)

Gi with the 427 and s95 and if throw a 100 shot of nitrous downlow to make up for spool. With just the turbo it would be bad.

engineermike

For a camshaft, based on your goals and engine combo, I would use a 230/240-115, +5.

Not sure if you really understand what you're getting into here. The S88 will support 1500 hp. In a 3400 lb car, that's good for 170 - 180 mph in the quarter mile. That's a whole different league of car. You're talking tube chassis, etc. . . And you're going to swap out to a larger turbo later for "an all out *** hauler"?

DrTurbo

iTrader: (3)

For what you are wanting to do, and S85 will still spool well and support your 1000rwhp goal. Kind of a nice compromise.

blown4now

I do understand what I'm getting into. The car will be on 345 18" drag radials and not slicks, just a car to enjoy driving...for the time being. I am prepared to some day in the future strip the car back down and build it for a drag car...just not right now.

But once again, plans have changed. I'm at my fabricators shop right now, and after talking with precision and a couple turbo guys, it looks like were going to spin a couple 70-72mm ball bearing turbos. After some debate, the motor size has been set to a 402, still using the LSX block and LS7 heads/intake though. For the street car fun and joy of driving, we've decided the twins would work better for the street. This doesn't change much. Still same hp goals, etc.

motorbuilt

iTrader: (17)

uhhh go with a 408" iron block with a S76 for the kinda driving and use your looking to do..... (and I wrote and just now read what you said above)

With that much motor, I see no need for twins...id go with a S76/78, it will spool... NOW...instantly

blown4now

Well everyone, including all the turbo companies, have said that my motor will choke a 76 single turbo. So, I was planning on the S88. But after deliberating, crunching some numbers, half a dozen phone calls, and some mexican food, we decided the twins would work best. So...just need to finalize the size of twins, but it'll be between 70-72mm turbos. With this setup, we are estimating full boost by 3200rpm, and still make over 1000rwhp. Soooo...sounds like a good time to me!

Also went up and priced my 345/30 18 drag radials today, and priced some CCW and Forgeline wheels. Still thinking CCW for weight/cost.

motorbuilt

iTrader: (17)

I dont think most people are referring to S-series turbos with a T6 exhaust side.

I think a standard T88 with a T4 would choke sooner than a S76.


You said 1000hp....that doesnt take nearly the turbo of the S88 for that kind of #'s..

Guys with much smaller 76mm setups like 76GTS's, q/p-trims etc are making 900hp....

If your concerned go with a S78...that will spool insane, much faster than a S88...which I think would be awesome on the street.


but now i see your saying 1000 rwhp...which is COMPLETELY different than 1000hp...

I have a feeling you should spend some time with the search button because alot of people think its much easier than it sounds to make that kind of power on the street.

DrTurbo

iTrader: (3)

I would go with the S88 or the new GT-88M as well. Both are awesome units and will support 1000rwhp

blown4now

Well again, for those just skimming, I'll repost this. After consulting with multiple sources, for the purpose streetability, I am doing a 402 LSX block, LS7 heads/intake with TWIN 70-72mm ball bearing turbos. This should support plenty of power, and provide good, quick spool with no choke from insufficient flow. Any tips on that would be great, but I think that's the final settlement. A few more phone calls and a bit more research will decide my final turbo size.

motorbuilt

iTrader: (17)

Go with a thicker deck than a stock ls7 head and youll get more boost before pushing water...

blown4now

Not using factory LS7 heads. I'm told ETP's are thicker.

theblur98ss

iTrader: (71)

sounds like an awesome build. Let us know how those drag radials work with 1k worth of ponies.

blown4now

My guess is they will melt The guy doing the fab work on my car has a Monte Carlo, should make around 2500hp...running MT ET Drags, 315/50/15s. Of course, his car is set up for the strip...but still...that'll be fun to see.