13+psi on Vortech, engine build question?
10-30-2008, 04:10 PM
#1
Registered User
Thread Starter
13+psi on Vortech, engine build question?
what do you guys recommend to run 13+psi on a Vortech supercharger (2.87+cog pulley)?
e.g. GTM 4.2 short block + 440 injectors?
or just a con rods+pistons+injectors?
might be upgrading the Supercharger to T-trim in the future
p.s. This is not a supercharger vs turbo debate thread
e.g. GTM 4.2 short block + 440 injectors?
or just a con rods+pistons+injectors?
might be upgrading the Supercharger to T-trim in the future
p.s. This is not a supercharger vs turbo debate thread
10-30-2008, 04:19 PM
#2
hatersgonnahate
iTrader: (162)
Might want to research GTM 4.2 sleeved sb's before you drop the money on them. Not trying to be negative, just thought you should know.
Youre going to need much larger injectors. You will max them out for sure.
Youre going to need much larger injectors. You will max them out for sure.
10-30-2008, 04:26 PM
#3
depends if that 13 psi is making power or just hot air.
you can run 16 psi if its still under 400 rwhp trq with no knock.
otherwise, standard motor build, rods, pistons (10.0 or higher compression), headgasket, 600+cc injectors, return fuel system is pretty standard for a supercharger build.
you can run 16 psi if its still under 400 rwhp trq with no knock.
otherwise, standard motor build, rods, pistons (10.0 or higher compression), headgasket, 600+cc injectors, return fuel system is pretty standard for a supercharger build.
10-30-2008, 04:54 PM
#5
Registered User
Thread Starter
thanks guys,
isn't 10:1 a bit on the high side for a built engine running high boost?
the GTM-sleeved might be un-necessary as mentioned, checking my options and appreciating your suggestions
isn't 10:1 a bit on the high side for a built engine running high boost?
the GTM-sleeved might be un-necessary as mentioned, checking my options and appreciating your suggestions
10-30-2008, 04:58 PM
#7
Registered User
Thread Starter
since I'll be investing in a new engine, chose to build a proper one that can stand daily drive+circuit racing putting in mind upgrades for the future.
Trending Topics
10-30-2008, 05:05 PM
#9
hatersgonnahate
iTrader: (162)
for the compression ratio you need to decide one thing now. Are you ever going to go with a turbo setup?
If the answer is no, then stick with something btw 9-10:1
If the answer is yes, go with something btw 8-9.5:1
Reason being is your Centrifugal sc is limited in how much boost it can actually produce. Youre limited by belt slip, pulley size and efficiency. Youll probably never see the kind of high boost pressures like others are seeing with turbo setups...say 20-25psi.
If the answer is no, then stick with something btw 9-10:1
If the answer is yes, go with something btw 8-9.5:1
Reason being is your Centrifugal sc is limited in how much boost it can actually produce. Youre limited by belt slip, pulley size and efficiency. Youll probably never see the kind of high boost pressures like others are seeing with turbo setups...say 20-25psi.
10-30-2008, 05:05 PM
#10
Registered User
Thread Starter
I was running the stock engine with the 2.87 for a whole racing season, it served me well. I ran the water/meth and was pumping around 400whp.
Tonight I added the cog and my engine blew in 4th
Didn't want to mention it in the thread coz it will drag it to another path
10-30-2008, 05:09 PM
#11
Registered User
Thread Starter
for the compression ratio you need to decide one thing now. Are you ever going to go with a turbo setup?
If the answer is no, then stick with something btw 9-10:1
If the answer is yes, go with something btw 8-9.5:1
Reason being is your Centrifugal sc is limited in how much boost it can actually produce. Youre limited by belt slip, pulley size and efficiency. Youll probably never see the kind of high boost pressures like others are seeing with turbo setups...say 20-25psi.
If the answer is no, then stick with something btw 9-10:1
If the answer is yes, go with something btw 8-9.5:1
Reason being is your Centrifugal sc is limited in how much boost it can actually produce. Youre limited by belt slip, pulley size and efficiency. Youll probably never see the kind of high boost pressures like others are seeing with turbo setups...say 20-25psi.
but, main concern is the day to day driving
10-30-2008, 05:12 PM
#12
hehe, well thanks
Glad I've been helpful.
oh, that FAQ is gigantic anyway and goes all over the place, probably no one would mind
but wow, sorry to hear about your engine, but still not bad if it lasted through a whole racing season worth of hard driving
what type of dyno did you get your 400whp reading on anyway?
Glad I've been helpful.oh, that FAQ is gigantic anyway and goes all over the place, probably no one would mind
but wow, sorry to hear about your engine, but still not bad if it lasted through a whole racing season worth of hard driving
what type of dyno did you get your 400whp reading on anyway?
Last edited by sentry65; 10-30-2008 at 05:15 PM.
10-30-2008, 05:50 PM
#13
Registered User
Thread Starter
I used a dynojet when I dynoed at 395whp and the AFR was bellow 10!!!
Added the water/meth and street tuned it with the AFR set 11@redline, my butt-dyno felt the increase in performance, not less than 400whp to be conservative
I meant to set it rich just to stand the torture of track abuse
Added the water/meth and street tuned it with the AFR set 11@redline, my butt-dyno felt the increase in performance, not less than 400whp to be conservative
I meant to set it rich just to stand the torture of track abuse
10-30-2008, 05:56 PM
#14
nice,
yeah that's the big reason I never tracked my Z once I started making more power - just seemed like suicide for the engine.
If I was going to track on the stock engine with FI on any sort of regular basis - yeah I would have done the same as you and kept it under 400whp or possibly even less
yeah that's the big reason I never tracked my Z once I started making more power - just seemed like suicide for the engine.
If I was going to track on the stock engine with FI on any sort of regular basis - yeah I would have done the same as you and kept it under 400whp or possibly even less
10-31-2008, 06:03 AM
#18
Registered User
Thread Starter
I was running around 11-11.5 psi when I was producing the 400whp figure. I added the 34-tooth cog-pulley which should add around 2-3psi more, which is way more than 400whp. The (stock) engine blew in 4th gear.
But anyways, this is not the issue, I'm still loking for my engine setup. Shall I build one myself or get a ready-made short block as (for example) the Forged Performance S1 Shortblock? I'm worried about the shipping too.
But anyways, this is not the issue, I'm still loking for my engine setup. Shall I build one myself or get a ready-made short block as (for example) the Forged Performance S1 Shortblock? I'm worried about the shipping too.
10-31-2008, 06:46 AM
#19
if you have a builder, just get the parts. like you said, the shipping will be prolly close to 1000$. did you bust your case? if so, maybe better just to get a built short block from forged, etc.
we pretty much told you what basic parts to look into. In the end, it boils down to your builder and his suggestions, as he'll be the one you are going back to if there are problems.
we (vortech owners) are all interested in your motor failure, as there has been very few people that have popped a motor with a vortech. did you bend your rods? I see high boost thats why i am particularly interested in the background Thats why i mentioned about about producing more power, or hot air. I used to run 14 psi with my vortech, but at the same power levels as 11psi. So it was all hot air, as the hp/psi went down. Makes the car knock like crazy. I wouldnt necessarily assume that over hp killed the motor. High heat coulda been knocking the motor as well, unless you have logs otherwise
we pretty much told you what basic parts to look into. In the end, it boils down to your builder and his suggestions, as he'll be the one you are going back to if there are problems.
we (vortech owners) are all interested in your motor failure, as there has been very few people that have popped a motor with a vortech. did you bend your rods? I see high boost thats why i am particularly interested in the background
Thats why i mentioned about about producing more power, or hot air. I used to run 14 psi with my vortech, but at the same power levels as 11psi. So it was all hot air, as the hp/psi went down. Makes the car knock like crazy. I wouldnt necessarily assume that over hp killed the motor. High heat coulda been knocking the motor as well, unless you have logs otherwise
Last edited by str8dum1; 10-31-2008 at 06:51 AM.
10-31-2008, 10:40 AM
#20
Registered User
Thread Starter
It could be knock or bad tunning as u mentioned... didn't get a chance to monitor AFR on redline, coz it blew on 4.5k RPM.. AFR was showing around 12.4 on 4k and was reducing.. was similar to the 2.87 reading... again, with that much boost on a high compression pistons, knock could be the reason.
Still wake up at night remebering the "boooom"
In my head, I knew It was a disaster waiting to happen and I had plans to get my engine built sooner or later. What to do? never look back, just think of solutions to avoid such misery
Still wake up at night remebering the "boooom"
In my head, I knew It was a disaster waiting to happen and I had plans to get my engine built sooner or later. What to do? never look back, just think of solutions to avoid such misery