Lt-5 Question
05-18-2008, 01:11 AM
#1
Intermediate
Thread Starter
Member Since: May 2008
Posts: 34
Likes: 0
Received 0 Likes
on
0 Posts
Lt-5 Question
is there really a big difference between the 385 horsepower lt-5's or the 405 horsepower lt-5's? i am wondering about durability differences if any. any feedback on this would be greatly appreciated.
05-18-2008, 08:22 AM
#3
Le Mans Master
the 93-95 had lighter pistons and rods, and they set the 405 "peak" rating a bit lower. graham did a very good presentation on the next LT5 and also discussed the many variants.
bottom line, ALL LT5s are extremely well built with very close tolerances, and very durable. the 90 LT5 set the FIA speed record, and the later model also passed a 400 hour durablility test.
the later model does feature a 4 bolt bottom end ladder, and some improvements here and there, but the 20 hp isn't all that significant as the later car got a bit heavier so they run pretty similar.
my stock 95 (it did have a chip) pulled 363 on the dyno, which is exceptional!
most are in the 340 - 350 range for the 93-95, with the 90-92 about 10-15 hp lower at the wheels. dyno results DO vary quite a bit so any true comparison needs to be done same day same dyno.
we've done that at SGC and gotten a good feel for what they will do!
bottom line, ALL LT5s are extremely well built with very close tolerances, and very durable. the 90 LT5 set the FIA speed record, and the later model also passed a 400 hour durablility test.
the later model does feature a 4 bolt bottom end ladder, and some improvements here and there, but the 20 hp isn't all that significant as the later car got a bit heavier so they run pretty similar.
my stock 95 (it did have a chip) pulled 363 on the dyno, which is exceptional!
most are in the 340 - 350 range for the 93-95, with the 90-92 about 10-15 hp lower at the wheels. dyno results DO vary quite a bit so any true comparison needs to be done same day same dyno.
we've done that at SGC and gotten a good feel for what they will do!
05-18-2008, 09:00 AM
#4
Intermediate
Thread Starter
Member Since: May 2008
Posts: 34
Likes: 0
Received 0 Likes
on
0 Posts
Lt-5
thanks for the info i have been looking at different year models and have not been able to close a deal on one yet but hopefully soon i will be able to close a deal on one.
05-18-2008, 09:26 AM
#5
Le Mans Master
05-18-2008, 09:27 AM
#6
Le Mans Master
Member Since: Oct 2004
Location: South-central Missouri
Posts: 6,314
Received 500 Likes
on
395 Posts
Some other minor stuff too...
The intake plenum runners and injector housings were opened up from 33mm to 34mm, and the injector housing was modified slightly. Another boost was had by improving the exhaust; getting rid of the restriction at the in/out of the resonator (going to an LT4-type).
The main cap ladder/cradle went from large two-bolts/main to smaller four-bolt configuration, but from talking to Marc Haibeck about it, I gather there is no significant difference in terms of reliability.
The LT5 has fascinated me from day one. With the DOHC 4-valve/cylinder, pent roof head the LT5 idles like yo mama's Buick in traffic, and howls like a banshee all the way to 7G!! With a die grinder and some time, a nice DIY winter project is to open the intake plenum and IH runners to 36mm, install LT headers and a 3" exhaust (B&B is what I have my sights set on), a Haibeck chip and be rewarded with about 400 RWHP w/o altering it's stock street manners!!
I've had Chevys all my life, but I've never experienced anything like the LT5. It is something you just have to experience to understand. Ain't nuttin' like um - at least not in the Chebby coral.
But, I digress...
P.
The main cap ladder/cradle went from large two-bolts/main to smaller four-bolt configuration, but from talking to Marc Haibeck about it, I gather there is no significant difference in terms of reliability.
The LT5 has fascinated me from day one. With the DOHC 4-valve/cylinder, pent roof head the LT5 idles like yo mama's Buick in traffic, and howls like a banshee all the way to 7G!! With a die grinder and some time, a nice DIY winter project is to open the intake plenum and IH runners to 36mm, install LT headers and a 3" exhaust (B&B is what I have my sights set on), a Haibeck chip and be rewarded with about 400 RWHP w/o altering it's stock street manners!!
I've had Chevys all my life, but I've never experienced anything like the LT5. It is something you just have to experience to understand. Ain't nuttin' like um - at least not in the Chebby coral.
But, I digress...P.
