Forcedvert

I have a forged 383 ls6 stroker build with 9.5 /1 is this too low of compression for a base a&a without turning up boost? Anyone running this set up? car has 342 rear and a4, cam 230/236 .61 lift 116 lsa, long tube headers, ported ls6 heads stock ls6 intake and tb. I know I can always throw more money at it later with fuel systems pully etc .but was looking to upgrade tranny first. I mean,it will be substantially quicker than my stock ls1 with same kit and no headers won't it? Please make me feel better while I'm waiting for it to get done! Thanks for any input .


Adam

robert miller

Car will do good Adam with a good tuner. I still would ger a Kenne Bell BOP on the car now.

winters97gt

Might be a sluggish a bit on the bottom but far from a mistake. Sounds like a good cam too.

c5mtl

Don't worry the car will feel more than fine! All this talk about being sluggish is nuts...I'm at 8.8:1 and I was told my car would be sluggish off boost....trust me it's not!!

MawneeC5

My iron block is at like 9:1 compression with a stage 3 blower cam. I took the turbo off a couple months ago and have been driving it around N/A. Car will still get up just fine without boost

winters97gt

M6-A4. Take a blower car from 9.5 to 10.5 with an M6 and you will notice the difference on the street at low RPM's. I've had both. So to me, it feels sluggish since I've had both. You're right, the A4 might be different.

Forcedvert

Thanks car already has BOP it came with sc kit.

Forcedvert

Do you think it will feel sluggish compared to stock ls1, no headers, with same sc kit as it was before new motor down low? Or just compared to same set up with higher compression?

c5mtl

I think the big difference is when the car is auto it's not like you have control of the rpm band like a manual....with an auto as soon as you hit the throttle and it drops a gear things happen fast...boost kicks in fast. I guess in a manual you can keep it in high gear and still get on the throttle without the revs shooting up like a auto....I guess that's where you would feel the sluggishness

Forcedvert

That is a good explanation of it, now I think I understand where those comments are coming from, thanks for putting me at ease.

reactor2

So here's the question: Why would you have a forged engine built and then run low boost? Why not just stick with a stock motor and low boost?
Also, slow and sluggish are personal opinion to some extent. There are plenty of members that think their stock vettes are fast (z or not) and then you have those that have crazy builds but always want more...because a 9 second trip down the quarter mile is an eternity.
If it feels sluggish just crank up the boost until it doesn't!!

Forcedvert

Stock motor was toast see original post. So I needed a motor anyway, 9.5 to 1 was what was recommended to me by my mechanics tuner, a well respected guy here!, I know I can "turn up the boost" but I don't have unlimited money and I will need a transmission sooner than later. A built forged long block was not much more $ than non forged with someone else building motor! I was kinda just killing time trying to figure out how car will feel compared to how it was with stock ls1 and sc. Thanks for your input though. I'm sure a fuel system, trans brace, meth, wheels, tires maybe a roll bar, more boost and the list goes on... Are all in the cars future, unless I fall into a bunch of money, then I will sell whatever I have and order c7 z06 convertable and just drive it!

reactor2

Since we are talking about fantasy money... If you fall into a pile of money wait 2-3 years for the mid engine zr1. In my opinion a mid engine 'vette will make all other 'vettes obsolete garbage.

reactor2

"Just drive it". That's what I planned when I bought my 'vette.

Forcedvert

I like verts, nothin like a winter drive in Florida in a fast convertable!

Forcedvert

Well maybe a world class super fast pure sports car would be ok too.

stevieturbo

Exactly !!

All this sluggish talk is just ********.

9.5 is a perfectly usable and safe CR

winters97gt

True, Stevie. If you like to have a nice hit back in the seat, without going in to a lot of boost and spraying meth, any setup is fine. A higher compression motor that makes more power lower in the rpm range is more fun for a 6 speed car.

stevieturbo

Mine is 6 speed, always has been, always will be.

I'm 9.0:1 and you could never say it's a slug or there are issues off boost.

Even more so when you have a blower there.

Any difference in power/torque with 10.5 vs 9.5 would be very small indeed

LedfootLarry

So what you are sayin is:
You like the low rpm "HIT" that a PD blower
provides
Its more fun for a 6 spd car
Sorry OP, just havin a little fun.