Lateral-g Forums - Twin turbo build help..

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- - Twin turbo build help.. (https://www.lateral-g.net/forums/showthread.php?t=39496)

Quote:

Originally Posted by camcojb (Post 451883)

The heat management issues with turbos will be as big or probably a bigger problem than IAT's with a blower. I know Mark Stielow's latest car had very good IAT's in real world conditions.

Jody,
Marks setup has had hours of dyno testing to get it where it's at. Plus, the cost of a Thompson built motor vs a ls with a magnacharger on top is a night and day difference in performance, engineering, and IAT numbers

Quote:

Originally Posted by DJW32 (Post 451957)

I understand that. I would look at more than just air temps when picking a forced induction direction. They all have advantages and disadvantages.

Look up the gearing in that GTO transmission. It isn't the best for a turbo setup IMO. the 2.66 1st gear style '98-02 Fbody transmissions would be better or if you can afford it a new T56 Magnum which is 10x better in all ways.

A stock pre '05 engine has LS1 style rods which are good to around 550-600rwhp before they bend. With a perfect tune it will last.... but in the end the rods will bend. LS2 style rods seem to be good to around 800-900rwhp.

A stock intake and TB will meet your power goals easily. A single turbo would meet your goals easily but twins are aesthetically more pleasing... and more $.

If you don't plan to AutoX or Road race your car you probably don't really need the aluminum block. Crunching the numbers with the power you want... it may be best to sell that LS1 instead of building it up... and get an '05+ style engine.

6.0 truck heads, arp or eBay studs, ls9 gaskets, mid to upper 22x°@.050" 114° lsa cam with good springs and a pair of 5858 provisions. it' 'll have way more power than a roots and be just as responsive. PM 417 Motorsports on here it you decide to go turbo.

You need to lower the compression to no higher than 8:1 . No higher otherwise you will have to run race gas.I would use a Blower/Turbocharger piston,with a strong bottom end. Good set of heads

8:1 compression is for dinosaur engines oe iron headed sbc and bbc with bad combustion chamber designs. LSX engine will be a slug on the bottom end like that

Excuse Me, I`m running a set of ported Eldelbrock Performer RPM Aluminum Cylinder heads.With 2:05 intake /1:60 Manley valves. And I run 15 lbs of boost. And I know a number of successful engine builders. 8:1 compression is the maximum compression.Unless you want to run alcohol or race gas.Other wise the pre ignition will kill the rings.

Quote:

Originally Posted by rons69camaro (Post 451698)

I'm currently in the middle of a twin turbo build/swap from a 383 on my '69 Camaro and looking for some advice/suggestions. I'll start with what I have for the swap.. A completely stock LS1 out of a '99 Camaro and a T56 out of an M12 '04 GTO. I made the same mistake as most and wasn't originally planning on going with a boost set up and also bought a set of TFS 220 heads that were milled to produce 11:1 compression with Mahle pistons and factory head gaskets.

My goal is to get to around 650 hp. What I'm trying to figure out: Should I sell off the heads for lower compression, do I need to do anything to the bottom end of the LS1, what turbos would be ideal/recommended, and what's recommended for the rest of the conversion (ie fuel set up tank pump injectors, transmission parts, wastegates, blow off valves, should I upgrade my intake and throttle body, etc.?

Where in this posted by the OP does say anything about a gen 1 small block? It's a LS1 which has much more efficient combustion chambers than any 23* sbc head. It will be a slug below 9:1 and it will be completely happy on 91-93 octane gasoline at 9.5:1. and if he decides to run E85 on a good tune it will live at 700hp on a stock long block plus a decent cam of which I would highly recommend LilJohn Motorsports.

My buddies and I know nothing about turbocharging LS engines.:mock:
My street/strip car
http://i574.photobucket.com/albums/s...psfa5afbf2.jpg
Fitz's T/A
https://lateral-g.net/forums/showthread.php4?t=30588

Quote:

Originally Posted by Zspoiler (Post 489730)

I'm sorry but you are a prime example of why the Internet is such a bad source for technical information. 8:1 compression was great in the early days of turbocharging but with today's technology it only makes fr a sluggish unresponsive "n/a" motor until the turbo is able to achieve positive pressure.

In today's modern day its not uncommon to see 9.5, 10, even 10.2:1 factory produced forced induction engines rinning on 91-93 octane pump gas. My personal car is 11:1 on pump fuel (e85) sees 24-25 psi with 24' of timing in boost and has been together making 4 digit rwhp numbers for 4 years currently with no issues.

Keep in mind sir, there's ALOT more to making a boosted motor happy then just compression ;)

Cheers

Blake