Turbo questions
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
Turbo questions Stock lq4 . intercooled 80mm turbo with 80lbs injectors on e85 and 799 heads. People say they pushing 15lbs boost on stock internals and 15* timing but never Specifying turbo size or anything else or fuel. Especially since all of that matters. I'm just trying to see what I can squeeze out of this stock block. And if I want more what would I have to upgrade? Forged pistons? Or piston and rods?
TECH Enthusiast
Joined: Dec 2017
Posts: 676
Likes: 72
People have pushed far more then 15 pounds on stock internals. Turbo needs to be as efficent as possible. Tune needs to be spot on. E85 for the win in my opinion. Pay attention to timing in the torque peak area.
As for stuff to upgrade to get more. Depends on the year of your lq4. If it gen 3 upgrade those rods if its gen 4 pour the boost to it. Either way on e85 youll be out of injector before you hurt anything if your tune is good. In my opinion.
As for stuff to upgrade to get more. Depends on the year of your lq4. If it gen 3 upgrade those rods if its gen 4 pour the boost to it. Either way on e85 youll be out of injector before you hurt anything if your tune is good. In my opinion.
An engine is basically an air pump. Boost is a measure of the efficiency of the system. The more efficient your air pump, the more air you flow through it, the more fuel you can add, the more power you get. A better flowing cylinder head and intake manifold, also known as a more efficient system, Will absolutely make more hp at the same boost pressure than a poorly flowing cylinder head. This will also lower intake air temps creating even more power. Your exhaust, cam overlap, back pressure, & many other variables can impact your boost psi also. A 30psi system @ 1:1 back pressure is going to make more than a 30 psi system with 1.5:1 back pressure. Really what you'll need to do is set goals. Blindly trying to build a car with no goals exhausts way more resources & funds than a properly goal ordinated build.
TECH Enthusiast
Joined: Dec 2017
Posts: 676
Likes: 72
Nismo is correct. Setting a goal like "i wanna build a 800hp lq4" would be alot easier to help with then what should i upgrade to make more. I went for weakest link but i could have just as easily said heads, block, forged rotating assembly, 210 injectors etc. Set a goal and start towards that. It will make you happier in the end all around.
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
An engine is basically an air pump. Boost is a measure of the efficiency of the system. The more efficient your air pump, the more air you flow through it, the more fuel you can add, the more power you get. A better flowing cylinder head and intake manifold, also known as a more efficient system, Will absolutely make more hp at the same boost pressure than a poorly flowing cylinder head. This will also lower intake air temps creating even more power. Your exhaust, cam overlap, back pressure, & many other variables can impact your boost psi also. A 30psi system @ 1:1 back pressure is going to make more than a 30 psi system with 1.5:1 back pressure. Really what you'll need to do is set goals. Blindly trying to build a car with no goals exhausts way more resources & funds than a properly goal ordinated build.
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
People have pushed far more then 15 pounds on stock internals. Turbo needs to be as efficent as possible. Tune needs to be spot on. E85 for the win in my opinion. Pay attention to timing in the torque peak area.
As for stuff to upgrade to get more. Depends on the year of your lq4. If it gen 3 upgrade those rods if its gen 4 pour the boost to it. Either way on e85 youll be out of injector before you hurt anything if your tune is good. In my opinion.
As for stuff to upgrade to get more. Depends on the year of your lq4. If it gen 3 upgrade those rods if its gen 4 pour the boost to it. Either way on e85 youll be out of injector before you hurt anything if your tune is good. In my opinion.
more specifically it's either an lq4 or lq9 as far as what generation it's out of a 2004 or 2005 I believe.
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
Apparently I have a gen 3. It's a 2005 and gen 3 didn't switch till 2007.5. So I'll have to up grade rods then. I'll prolly just buy rods and pistons sets. Easier and more worth it. I've seen some people swap and use "old piston rings" good idea or moron idea
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
All lq9's had flat top pistons, floating pins and the gen 4 style rods. And most engines 04 and up have the gen 4 rods as well.
for what its worth I have a stock lq4, stock heads, ebay head studs, btr stage 2 turbo cam and of course dual valve springs. Running a Borg Warner S484 (96/88) at 15lbs right now on E85 as well. Only drive this car hard and it's only driven on the street. Just make sure you have a lot of fuel. I'm not sure 80lbs injectors will get you to 800rwhp on e85. I'm running 130's right now with dual 450s. Previous guy made 1100rwhp on e85 maxing them out. Again this is what I heard I am not 100% sure. I'll be going back this spring to turn boost up to mid 20s gunna make this sbe work.
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
for what its worth I have a stock lq4, stock heads, ebay head studs, btr stage 2 turbo cam and of course dual valve springs. Running a Borg Warner S484 (96/88) at 15lbs right now on E85 as well. Only drive this car hard and it's only driven on the street. Just make sure you have a lot of fuel. I'm not sure 80lbs injectors will get you to 800rwhp on e85. I'm running 130's right now with dual 450s. Previous guy made 1100rwhp on e85 maxing them out. Again this is what I heard I am not 100% sure. I'll be going back this spring to turn boost up to mid 20s gunna make this sbe work.
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
that single walbro 400 will not get you there on e85 it will get you to about 10 or 11 psi boost then it will start to loose afr going lean in high gear. add a second one or go to a aem 380 second pump if you do that the 80# injectors will go pretty fast.
my nova is setup like that and 17 psi boost it still has fuel left. my buddys 5.3 ran 9.17 at 147 last time out on 80# injectors on e85 23 psi boost 55 psi fuel pressure.on all stock 220.000 mile internals rings,bearings,and rod bolts are all stock
if your lq4 is a 2005 just gap the rings and use ls9 head gaskets and a boost cam and it will live just fine . my nova engine is a 2005 lq4 with 187.000 miles and has been running as a turbo engine for 5 years and in the 9s for half that time. ring gaps are .025, ls9 gaskets , e85,stock truck intake and brackets. single borg 80/83.
my nova is setup like that and 17 psi boost it still has fuel left. my buddys 5.3 ran 9.17 at 147 last time out on 80# injectors on e85 23 psi boost 55 psi fuel pressure.on all stock 220.000 mile internals rings,bearings,and rod bolts are all stock
if your lq4 is a 2005 just gap the rings and use ls9 head gaskets and a boost cam and it will live just fine . my nova engine is a 2005 lq4 with 187.000 miles and has been running as a turbo engine for 5 years and in the 9s for half that time. ring gaps are .025, ls9 gaskets , e85,stock truck intake and brackets. single borg 80/83.
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
that single walbro 400 will not get you there on e85 it will get you to about 10 or 11 psi boost then it will start to loose afr going lean in high gear. add a second one or go to a aem 380 second pump if you do that the 80# injectors will go pretty fast.
my nova is setup like that and 17 psi boost it still has fuel left. my buddys 5.3 ran 9.17 at 147 last time out on 80# injectors on e85 23 psi boost 55 psi fuel pressure.on all stock 220.000 mile internals rings,bearings,and rod bolts are all stock
if your lq4 is a 2005 just gap the rings and use ls9 head gaskets and a boost cam and it will live just fine . my nova engine is a 2005 lq4 with 187.000 miles and has been running as a turbo engine for 5 years and in the 9s for half that time. ring gaps are .025, ls9 gaskets , e85,stock truck intake and brackets. single borg 80/83.
my nova is setup like that and 17 psi boost it still has fuel left. my buddys 5.3 ran 9.17 at 147 last time out on 80# injectors on e85 23 psi boost 55 psi fuel pressure.on all stock 220.000 mile internals rings,bearings,and rod bolts are all stock
if your lq4 is a 2005 just gap the rings and use ls9 head gaskets and a boost cam and it will live just fine . my nova engine is a 2005 lq4 with 187.000 miles and has been running as a turbo engine for 5 years and in the 9s for half that time. ring gaps are .025, ls9 gaskets , e85,stock truck intake and brackets. single borg 80/83.
you mean the stock lq9 cam? if that is what you meen yes you can just use the gm blue springs and they run pretty good. my brothers Silverado ran 11.30 with a stock lq4 with just springs only at 4300 lbs. but the cam is done by about 5800 rpm
Thread Starter
Teching In
Joined: Dec 2017
Posts: 29
Likes: 0
the previous owner told me ls9 or ls6 cam