lm1clive

Well I've gone and done it now, just dropped off my GM Crate LS7, with its new owner.......

So am having a motor built (Prob by AES), Goals are a fast revving Twin Turbo with a max rpm of 8,000 hoping to have a peak in the 7300-7500 range, roughly 1000bhp (Well started at 800 but I have to stop somewhere) not looking to build a torque monster, (Cars only 2200lbs) so will have to have some fancy mapping and Boost control to stop breaking my 996TT transaxle. 800lbs will be ok. Newbe at this leave of turbo power, only had 4 bangers with turbos before....

Thought so far are:-

RHS block std deck 4.130" bore, machined for 60mm Needle Cam bearings
Forged LS1 Crank 3.622" (would like to go shorter but still not sure yet)
All ready have:-
GM LSX 6bolt Heads Ti inlet, Inconel exh soon to be ported.
Daily Dry sump system 7 Stage (billet pan 4 stage engine scavenge 1 stage turbo scavenge and a De-airator)
Tilton 4 plate Carbon Carbon Clutch
Meziere remote WP with inbuilt recirculating Thermostat
DTA S80 Pro ECU
AIM MXL Pro Dash logger
oh and a all most built chassis and body of my own design to put it in .
Gearbox (Transaxle) 996TT modified with a Taller 1st gear and a new 3.1 CWP, internal oil spray bar Kazz diff and lot of other nice bits.

lm1clive

Still changes to come but you get the general idea...

lm1clive

My last Car, built from a kit but with a old school SBC...

vettewreck

iTrader: (1)

Looks like an Ultima GTR or a Aspira F620... Love both. Just wish the windows went down in the GTR.

lm1clive

A customer build we did back in the UK, you can see my replacement for my yellow car behind it 01 C5....

Excuse the shorts but he's me with this car after correcting a distributor problem we had...

lm1clive

Close but only the windscreen is now the same as a GTR, every other panel is changed the WB is longer and the chassis is completely different now.... but that's another story...... Back to the motor..

lm1clive

Turbos I'd like water cooled (extended track use, and the fact i can cool them after switch off with my EWP ) so was looking at Garrett's either the GTX3576R or the GTX3582R. I know they will make my power goals but with the extra RPM I just don't know if they will run out of puff at 8K ??? I don't want to go any bigger than I need but like a said this is new territory for me....

gnx7

iTrader: (28)

I was in a Ford GT with twin GT35Rs that truly spooled almost too fast. A good traction control unit and boost by gear is a must with any hopes of consistently putting down the power.

chuntington101

Clive, do you really need the extra 1000 rpm? just thinking a built LS3 block might be a cheaper option than the RHS? GM decided to stick to the LS3 bore / stroke numbers for the ZR1 and that worked pretty well. Just a thought.

lm1clive

That's exactly what what I'm after, something that needs to be tamed by electronics. Boost tables, speed over throttle with corrections for gear selection.... and yes TC is a must. The more i here about the GT35's the more i like them....

DEFYANT

I personally would have LME or Billy Briggs build the engine. Other than that, this is going to be a sweet freaking build!

lm1clive

I want it as over square as possible, so really going to 4.130" was the best option for me, plus the larger bore makes for bigger valves is in the heads better flow etc etc.... would love to run a 3.25" crank seeing as there are lots of 347 combos revving to over 9k, but I don't need any more than 8k to make 100mph in second gear I have a target 0-100-0 to beat and a certain Guinness record to be faster than....

qqwqeqwrqwqtq

3582R's with a 1.06 housing would be responsive and a great combination for the car but it isn't going to peak at 7500 and turn to 8k. You would have to go quite a bit oversized on the turbos (turbos capable of far exceeding your power goal) in order for it to make power at that rpm. (or run them on a 4.8).

lm1clive

I was hoping not to go to big but it's the trade off I'm getting told about alot now.... never a perfect world...

GT4094R would that make more sense....

lm1clive

AES are going to build my motor now, RHS on the way. So first decision to make here, to meet my RPM goals do I under size the engine or over size the turbos...... 3.25" stroke and keep the GT35's or take the easy route 3.622" and maybe swap them out for a GT40 or even a Borg Warner (Seeing as the cost of a BW is half that of a GT40)....

WstSidHomE

3.622 and gt40

chuntington101

Clive, Have you spoken to someone like Universal turbos? They might be able to recommend a hybrid unit that will work. Pretty sure they built the turbos used on Red Victor. Think they even anodize the compressor wheels these days.

lm1clive

That's this weeks job phone as many Turbo experts as possible.

lm1clive

Well AES now has my block in and has started the machining processes. Final bore stroke is 4.125" with a Lovely Magnum XL 3.5" (the crank weighs 15lbs less than a Std LS7 from GM) WOW when I herd that I was OK go for it...

Machining the Cam journals for a 60mm cam core but have been told better to keep the oil feed normal white metal bearings over a roller bearing, so that's whats there doing. Having the Lifter bores enlarged to fit a bigger lifter and lifter roller so that should give the cam guy (Martin) more scope.

I bought a set of LSX GM 6 bolts and Aes are porting them for me plus fitting new Inconel exh valves and springs etc....

On the Turbo front I'm defiantly going with twin Borgs 66mm, they seem to be in the correct efficiency window for my rev requirements now just hunting for the best deal / billet wheel units I can find, hopefully with a nice .9 V band housing. Once engine paid for and on the way then that's the next purchase...

lm1clive

Oh yes on another thread I was told go look at the Holley Dominator EFi unit (as i would like twin DBW TB), was pleasantly surprised by what I found, way more outputs and plenty of capability in controlling everything i wanted, plus that lovely Learning feature got me wanting one...

So my ECU is up for sale and the the Dominator will be bought once my DTA unit has gone....