STS news flash
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Joined: Nov 2001
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From: Bellevue, Wa
STS news flash as I gather info I will be making these type of posts.
stock engine with turbo spec cam, stock manifolds with cats, t70 with .96 AR
just installed, only running 5psi (waiting on alky kit)
spools anywhere from 3,000 to 3,800 depending on gear.
this is NOT my car, just reporting what was told to me. I will check it out in person in the near future.
Turbo experts... question for you. Does the amount of boost you are running effect spooling? IE when he cranks it up to 15psi would that effect spool time? My guess is no, but wanted to ask.
stock engine with turbo spec cam, stock manifolds with cats, t70 with .96 AR
just installed, only running 5psi (waiting on alky kit)
spools anywhere from 3,000 to 3,800 depending on gear.
this is NOT my car, just reporting what was told to me. I will check it out in person in the near future.
Turbo experts... question for you. Does the amount of boost you are running effect spooling? IE when he cranks it up to 15psi would that effect spool time? My guess is no, but wanted to ask.
strange it spools at different points on different gears? you sure?
mine always spools the same time no mater what gear, the tach needle just moves faster in lower gear
spool time will be the same, max boost will be different, i generally judge spool time wheni see max boost so if you judge it that way yes moving up the boost will cause later spool time, but if you judge by when you start seeing positive pressure then no it will be the same point.
mine always spools the same time no mater what gear, the tach needle just moves faster in lower gear
spool time will be the same, max boost will be different, i generally judge spool time wheni see max boost so if you judge it that way yes moving up the boost will cause later spool time, but if you judge by when you start seeing positive pressure then no it will be the same point.
Thread Starter
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Joined: Nov 2001
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From: Bellevue, Wa
ahhh interesting.
so when people say spool time they are talking about as soon as it hits boost?
I thought it meant when they say full boost.
as far as being sure, no, not until I see it for myself.
I'm just spitting out info as I get it since there is a lack of info out there on these things.
I will be reporting on a completely stock 98 camaro with the t67 .81 AR housing soon.
It should hit the dyno tommorrow or Friday.
so when people say spool time they are talking about as soon as it hits boost?
I thought it meant when they say full boost.
as far as being sure, no, not until I see it for myself.
I'm just spitting out info as I get it since there is a lack of info out there on these things.
I will be reporting on a completely stock 98 camaro with the t67 .81 AR housing soon.
It should hit the dyno tommorrow or Friday.
12 Second Truck Club
Joined: Feb 2002
Posts: 5,574
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From: Sacramento, CA
As far as I can tell most of the time the term lag means form the time you nail it till you can start to register positive boost. Not full boost. But as with any term this gets confusing and noone knows exactly how you mean it unless you state how your term "LAG". When i say it I mean till I see boost but when I drove my truck last the time between measuring ANY boost and hitting full boost was so friggin fast that I didn't really have time to try and look at the tach and see how much RPM was between 1psi and 13psi. LOL Lag, yeah hahaha
Ohh, I'm gonn akill the owner of the above mentioned car if it hits the dyno before my truck does....
LOL
Ohh, I'm gonn akill the owner of the above mentioned car if it hits the dyno before my truck does....
LOL Thread Starter
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Joined: Nov 2001
Posts: 2,659
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From: Bellevue, Wa
maybe, maybe not. depends on your power goals. this guy is planning on running 15+psi on a built motor.
your .68 may choke things off if / when you go for big power.
regardless the nice thing is exhaust housings are relatively cheap to swap out so if he finds the .96 is just too doggy he can always switch it out.
definetly let us know how the .68 spools up and performs.
the more info the better.
your .68 may choke things off if / when you go for big power.
regardless the nice thing is exhaust housings are relatively cheap to swap out so if he finds the .96 is just too doggy he can always switch it out.
definetly let us know how the .68 spools up and performs.
the more info the better.
Trending Topics
Originally Posted by Blackbird
as I gather info I will be making these type of posts.
stock engine with turbo spec cam, stock manifolds with cats, t70 with .96 AR
just installed, only running 5psi (waiting on alky kit)
spools anywhere from 3,000 to 3,800 depending on gear.
this is NOT my car, just reporting what was told to me. I will check it out in person in the near future.
Turbo experts... question for you. Does the amount of boost you are running effect spooling? IE when he cranks it up to 15psi would that effect spool time? My guess is no, but wanted to ask.
stock engine with turbo spec cam, stock manifolds with cats, t70 with .96 AR
just installed, only running 5psi (waiting on alky kit)
spools anywhere from 3,000 to 3,800 depending on gear.
this is NOT my car, just reporting what was told to me. I will check it out in person in the near future.
Turbo experts... question for you. Does the amount of boost you are running effect spooling? IE when he cranks it up to 15psi would that effect spool time? My guess is no, but wanted to ask.
Last edited by trtturbo; Aug 11, 2004 at 04:52 PM.
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Originally Posted by Blackbird
I agree, I am betting he will eventually move to a smaller housing.
I myself have a t67 with .81 sitting in the garage that I will be installing in a couple of weeks.
I myself have a t67 with .81 sitting in the garage that I will be installing in a couple of weeks.
Get cracking!!
Remember guys, all bets are off on normal thinking here for A/R housings. A .68 A/R on a rear setup is going to react and spool alot like a .96A/R front mounted version. You are losing exhaust gas energy quicky. So you have to compensate by reducing your A/R to keep velocity up. As for swapping housings, yes they are easy to do. I swap many MP T70 housings out for customers for larger units for a resonable charge, and still comes out cheaper then your normal PTE, T-netics units.
Jose
Jose
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Joined: Feb 2002
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From: Sacramento, CA
That's why I am going off the deep end and trying the GT67 and .96 exhaust housing. I wanted to go much bigger than my GT35 w/ .68 housing and see if spooltime is really bad or what happens to power. More of a test really so myself and those at STS will know what to expect and be able to better recomend units to customers. If it's too lagy I will simply swap the .96 housing to the .81 and call it good.
Thread Starter
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Joined: Nov 2001
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From: Bellevue, Wa
stock camaro update.
91 octane, 5psi, no alky, 90 degree day. I was told inlet temps immediately after the run were 160.
the first run made with no boost (not sure how they did that) was 289/310
with 5psi 401/410 - a little dissapointing in my book but I know tuning isn't complete and I am guessing you guys making more than this on 5psi have better than 91 octane?
today they kick on the alky and crank it up to 8 or so.
depending on how the alky works for the camaro guy, I am begining to seriously consider adding an intercooler to my setup when I install it.
he also mentioned boost creep. what are the typical causes of that?
91 octane, 5psi, no alky, 90 degree day. I was told inlet temps immediately after the run were 160.
the first run made with no boost (not sure how they did that) was 289/310
with 5psi 401/410 - a little dissapointing in my book but I know tuning isn't complete and I am guessing you guys making more than this on 5psi have better than 91 octane?
today they kick on the alky and crank it up to 8 or so.
depending on how the alky works for the camaro guy, I am begining to seriously consider adding an intercooler to my setup when I install it.
he also mentioned boost creep. what are the typical causes of that?
Wow, 160 with only 5psi. Better watch for knock. As for boost creep, that means the wasetgate is a little to small. What size gate are they using with the STS systems? It its a Tial 38, then that is borderline.
Jose
Jose
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From: "Tr"Asheville
Boost creep is typically caused from an inefficient wastegate setup/location. Those numbers are actually great if you ask me. On 5 psi you should make approximately 34% more HP. In this case at a base RWHP of 289 5psi should have only gotten you 387rwhp. You have to remember that boost makes power based off of your original HP level. Doesn't sound to bad to me, besides the boost creep which can be fixed.
-Sly
-Sly
Thread Starter
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Joined: Nov 2001
Posts: 2,659
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From: Bellevue, Wa
yah 160 is no suprise though with no intercooling.
I will have to look up what size the wastegate is. Even though it isn't my car I sent email to STS to see what they have to say.
I am also going to make sure the have a good vacumn signal going to it.
What makes for a good/bad wastegate location? I assume you all have seen it, but here is how/where the STS mounts theirs.
I will have to look up what size the wastegate is. Even though it isn't my car I sent email to STS to see what they have to say.
I am also going to make sure the have a good vacumn signal going to it.
What makes for a good/bad wastegate location? I assume you all have seen it, but here is how/where the STS mounts theirs.
