Well I have decide to make my KYTP Shop Car (2000 Z28) Stupid. I mean Wicked, Stupid, & Nasty.


I am gonna build a turbo setup around that 91.5mm unit. Something like the following:
-Custom Small Frame 91mm Thumper By Forced Inductions.
-6.0L manifolds (unless I decide to build some tube headers)
-JGS 60mm Waste Gate
-JGS 56mm Piston BOV
-2.5" charge pipes
-4" Downpipe
-3" intercooler pipes
-Staying with the current FMIC (yes Air to Air)
-Dual nozzel Meth injection

My kicker in the build is to use the 370 that I have in the car. The short block at least, or build the 408 I have in the shop. I have the block and 4" Cola crank. I am going to fund the turbo build with the sale of the current turbo setup that is on the car.

I have thought of keeping the 370 and adding some AFR 225 heads and my Victor Jr intake and Elbow. It is a solidly built engine with Mahle dished pistons and Eagle rods.

If I go the route of the 408 I would fund it by selling the 370 that is in the car. The 408 would most likley consist of the 4" Cola crank I have, Eagle rods, ? Brand ? dished pistons, and some AFR 225's.

Building a thumper setup for the LS1 Camaro has been a long term goal of mine since opening the shop. I am not looking to compete in a particular class or set an new record by any means. The car is a advertising tool for the shop and a toy for me. I will continue to use the FAST XFI for tunning, TH400 and Yank Verter (which will be restalled), I will change the gears from 3.25's to a 3.50 or 3.70, and will be running 325/50/15 MT DR's full time on my stock width 9 inch.

I have added a poll for you guys to show what you would do about the engine.

Let me know what you guys think. This is gonna abe a drawn out project for me as Customer builds come first.

 

If you are going to take advantage of the power that turbo can support and want it to stay together. Sell the 370, buy yourself a lsx block and 6 bolt heads and if your rotating assembly is up to task use it in the lsx build.

I do have to warn you though, you will be the second slowest 91mm lsx 408 car in ky if you do that.

 

If you willing to start from scratch I would do the same, LSX block and 6 bolt heads. I don't know when a 4__ci engine ends up being too big for a 91.5mm turbo, but I'm guessing that it's a workable combo.

 

 

I am not sure the LSX block and 6 bolt heads are in the budget. What do those heads and an LSX block run price wise? Anyone have a hook up that can offer me a deal? I still have to sell the 370 to fund the new engine build no matter what I do. The 370 in the car with a nice set of heads would be fun for a while with what I will do with it. It would make alot more power than I will be able to use.

I am by far not trying to be the fastest by any means. Big turbos make stupid boost on holiday. I will likley keep it regualted down to 18-20lbs on the waste gate.

 

I think the blocks are $1800.

I'm in a similar boat, I have 7.9:1 348ci + a GT47-88. I like the idea of going to a GT55-91 someday, and if I did that I would upgrade to an LSX block with this forged stock stroke crank I have lying around.

 

My thing is a I tend to be cheap. I have a freshly machined 6.0L block and 4" Cola crank already. I am rods and pistons away from my 408. I dont really have any desire to have the most powerful turbo setup out there. I just like huge Thumper turbo's. If I build another engine I will use the block and crank I have and build a simple yet stout 6.0L based 408 with AFR 225's. If I was looking to go Drag Radial or Outlaw racing I would step up to the new block and 6 bolt heads. This build is more of a bragging rights thing with the local guys at the track. None of them think I will do it.

Hell I was super impressed with Anthony's PT88 408 setup and the power it produced. I just bouhgt the 91.5mm for less than what I gave for my last PT88.

I also tossed around the ide of selling all of my LS1 stuff and going SBC. I just dont like the idea of having a SBC setup when I cater to the LS1 crowd. A nasty turbo SBC setup might open up some avenues for new business though.

 

Steping up into a large frame 91 give you alot of room as far as displacement. I was told up to 45x inches that turbo would work, that being said im sure its "sweet spot" is smaller ci's.

 

Use the 370ci with some good heads and intake.

 

The last time I ran a 91.5mm turbo was on a 347ci Ford with an A4 block and TFS R heads. I got it to spool real well with that engine and it made a little over 1200rwhp.

Keeping the heads down is the only thing I am concerned about. That was the reasoning behind the AFR 225's or the World Products heads. The will get me thicker decks and the 72cc chamber I want and flow well out of the box. I know the engine will have some Lag before boost . I dont mind that. Lag is traction control.

I am leaning toward the 6.0L 408 real hard. I just have to decide for sure before listing the 370 for sale. I am only lookin gto get $3600 out of the long block with the TU1 cam and LS6 intake. The only thing I am keeping are the front and rear covers and oil pan.

 

You think the 370 is a better option for the setup over the 408? Could you explain why? I have a Victor Jr intake and elbow already.

All I need for the 370 is a better suited cam for the 91.5mm and the new AFR 225's or World Products 225 heads.

 

You said you were cheap,so I was helping Of course a 408 would be better but both will make great power.The 408 will make more power with less boost which will help the heads stay on.

 

Could someone explain what particularly would be better about doing the LSX block/6 bolt head setup as opposed to his proposed 408 build?

 

I would go 370 if you already have it built, if not, then go 408, it will be easier to light that unit off with it. Also their is a reason why you gave less for that 91mm then your 88. That sucker is OLD......heck its not even a threaded comp wheel. That unit will spool SLOW and will probably not make more then a good old 88mm TV series unit. Might want to think about that.

 

Ability to keep the heads down is the first thing.....

 

I'd say the 2 extra bolts holes per cylinder...lol. One of them being right in the path of where the haskets blow/heads lift with any other block currently. The lsx also has a long list of other advantages over a current block.

 

I'd go with a LSX block....but, that's just me.

 

i dont think theres really a need to go all out with the LSX block. building the 408 would be nice, but for a budget build, the 370 is right there. the 408 would spool the turbo faster and give the heads less boost (thus, keeping them on the block)

370 for budget

 

So both of you think a boost number has to do something with lifting heads? Not clyinder pressure and power? I always assumed you could have to motors of the same ci one with a stock top end, another with a great top end. They could make the same power but at totally different boost levels....and you think the higher psi motor would be more likely/prone to lifting heads?

 

DrTurbo I sent ya a PM.