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HARROP TVS, What You Need To Know & FAQ

Old 05-28-2010, 12:18 AM
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Aight man, well good luck. The 2.8 and smaller feels pretty good. The 2.7 and 2.6 are even better than a 2.8

I'll have to see how the TVS feels when I get it Tues and go from there. I have a feeling I'll be buying 80#'s and a pulley after awhile.
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Old 06-07-2010, 05:56 PM
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Anyone know what the 'safest' TVS pulley is on a 'stock' longblock. Still running stock springs, head bolts, head gasket, etc, and I'd like to pulley down without popping it.
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Old 06-07-2010, 06:40 PM
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I am runing the TVS with a 2.8 pulley, 80s and E85 and my Injector duty cycle is right at 95% so with gas you could easly run a 2.6 with the 80s.
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Old 06-07-2010, 07:07 PM
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Great to know thanks. I am mainly concerned with boost and cylinder pressure on the stock engine however, but I presume that is too highly variable to really know a 'safe' limit
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Old 06-08-2010, 12:13 AM
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Originally Posted by roderick View Post
I am runing the TVS with a 2.8 pulley, 80s and E85 and my Injector duty cycle is right at 95% so with gas you could easly run a 2.6 with the 80s.
whats ur afr at?
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Old 06-08-2010, 07:21 PM
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Originally Posted by csementuh View Post
Great to know thanks. I am mainly concerned with boost and cylinder pressure on the stock engine however, but I presume that is too highly variable to really know a 'safe' limit
A lot of it really has to do with KR. What people fail to realize on pump gas is that conditions change daily. Temps change, cyl temps change, etc. Just because one day you don't have any KR, doesn't mean the next you won't. When you start to run high high boost applications this really starts to come into effect. You could probably get away with running a 2.6 tvs with lower amounts of timing. If you planned on doing this though I would highly recommend e85. I have personally ran a 2.7 tvs and e85 and the car was absolutely amazing. My injectors, 80lbers, were maxed at 6grand though. I plan on running 98lb injectors shortly and a 2.6 pulley on the tvs to put down some great hp/tq numbers. The difference between pulley drops and gas to e85 is absolutely amazing =D.
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Old 06-08-2010, 07:54 PM
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Originally Posted by RooTBeeR View Post
whats ur afr at?
My 95% idc was when I was running 11.5 air fuel or 7.5 e85 air fuel.

Now I am running 11.7 air fuel or 7.7 e85 air fuel.
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Old 06-08-2010, 10:26 PM
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yikes, so what did ur idc% drop to @ 11.7(7.7)?
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Old 06-08-2010, 10:42 PM
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Originally Posted by RooTBeeR View Post
yikes, so what did ur idc% drop to @ 11.7(7.7)?
its right at like 93% not alot of a drop but still safe to run.
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Old 06-08-2010, 10:45 PM
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haha, im still on the 3.15 and 91octane @ 11.8afr and only at like 80%
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Old 06-08-2010, 11:30 PM
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Originally Posted by RooTBeeR View Post
haha, im still on the 3.15 and 91octane @ 11.8afr and only at like 80%
Yeah I was at like 70 on gas with stock pulley and 60s. Somthing like that. We should add to this thread the pulley size and IDC people see with that pulley on gas and e85.
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Old 06-08-2010, 11:33 PM
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yeah, might be a good idea
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Old 06-08-2010, 11:57 PM
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There are a lot of factors to that tho. My fuel pump rewire lowers it a little. AFR changes IDC, then you have methanol and fuel type.
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Old 06-09-2010, 02:13 AM
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Originally Posted by WickedSS2005 View Post
There are a lot of factors to that tho. My fuel pump rewire lowers it a little. AFR changes IDC, then you have methanol and fuel type.
exactly...just like boost from one car to another will be diff



since ls4 TB is out of the question, would a ported stocker help?

so which fitting to i weld on the PCV? -10an or -12an?

oh and anybody think itd be worth it to mount like 1-2 of these http://www.jegs.com/i/Derale/259/16307/10002/-1 to this http://zzperformance.com/cobalt_ion/...=895&catid=178 to help keep iat2's down/more constant wether at idle, cruising, or wot?

Last edited by RooTBeeR; 06-09-2010 at 04:32 AM.
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Old 06-09-2010, 01:03 PM
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Originally Posted by WickedSS2005 View Post
There are a lot of factors to that tho. My fuel pump rewire lowers it a little. AFR changes IDC, then you have methanol and fuel type.
Did you buy a fuel pump rewire or did you make one? I'd like to try and make one since a relay and a few wires doesn't seem worth $35. I'm not sure if I actually need one, but I guess it couldn't hurt...
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Old 06-09-2010, 05:58 PM
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Originally Posted by RooTBeeR View Post
exactly...just like boost from one car to another will be diff



since ls4 TB is out of the question, would a ported stocker help?

so which fitting to i weld on the PCV? -10an or -12an?

oh and anybody think itd be worth it to mount like 1-2 of these http://www.jegs.com/i/Derale/259/16307/10002/-1 to this http://zzperformance.com/cobalt_ion/...=895&catid=178 to help keep iat2's down/more constant wether at idle, cruising, or wot?
-10an for the pcv

Originally Posted by csementuh View Post
Did you buy a fuel pump rewire or did you make one? I'd like to try and make one since a relay and a few wires doesn't seem worth $35. I'm not sure if I actually need one, but I guess it couldn't hurt...
Onlt cost of shipping, $5. I tested for OTTP and took the pics for install directions

Last edited by WickedSS2005; 06-09-2010 at 05:59 PM. Reason: Automerged Doublepost
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Old 06-10-2010, 12:25 AM
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^ Good deal. I put together a pump rewire tonight and hopefully I can install it this weekend. Might help at high RPMs to keep a steady flow to the rail. What size fuse are you running on the inline fuse? 20? 25? 30?
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Old 06-10-2010, 09:36 AM
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Originally Posted by csementuh View Post
^ Good deal. I put together a pump rewire tonight and hopefully I can install it this weekend. Might help at high RPMs to keep a steady flow to the rail. What size fuse are you running on the inline fuse? 20? 25? 30?
Let me know how that works. I am out of fuel in my car 4th gear at 6300 rpm.
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Old 06-10-2010, 10:02 AM
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$35 is too much for a harness?
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Old 06-10-2010, 10:13 AM
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Originally Posted by roderick View Post
Let me know how that works. I am out of fuel in my car 4th gear at 6300 rpm.
I'll be intstalling it with my 80's this weekend probably. You are also running E85 on a smaller pulley however so it's not a very good comparison. If I get a change to install the rewire first and log with my 60's I will, but if not I won't have a basis for comparison with the 80's.

Originally Posted by fast98 View Post
$35 is too much for a harness?
I didn't say it was 'too much', I said it was 'not worth it', I should have worded it as 'not worth it to me'. I had the parts essentially laying around and the know how to make it, so free > any money. That wasn't a rude comment towards OTTP (especially since other vendors sell the harness for the same amount, and I've been super happy with the stuff I've bought from you). You're also basically the only vendor who ever answers questions. Sean is impeccable with answering PM's, and I believe I've talked to you on the phone before. So don't act like I've insulted you, it's all good. =)

Last edited by csementuh; 06-10-2010 at 10:16 AM. Reason: Automerged Doublepost
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Old 06-10-2010, 10:21 AM
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I'm not insulted. New price is $29.99 http://www.ottperformance.com/store/...-Kit-9p918.htm

zzp used to sell their kit for $50 before we made one. FYI
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Old 06-10-2010, 10:39 AM
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Originally Posted by fast98 View Post
I'm not insulted. New price is $29.99 http://www.ottperformance.com/store/...-Kit-9p918.htm

zzp used to sell their kit for $50 before we made one. FYI
OK Good, because OTTP rocks!

Those 'other guys' have always given me a problem, and I've bought tons of stuff from them. They hassled me like crazy after a $10 Interceptor 'SS' face I bought got lost in the mail, and it took then a couple of months to send me a new one.
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Old 06-10-2010, 10:49 AM
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Originally Posted by WickedSS2005 View Post
-10an for the pcv



Onlt cost of shipping, $5. I tested for OTTP and took the pics for install directions
Thanks!
Originally Posted by fast98 View Post
I'm not insulted. New price is $29.99 http://www.ottperformance.com/store/...-Kit-9p918.htm

zzp used to sell their kit for $50 before we made one. FYI
good price!
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Old 06-23-2010, 11:28 AM
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Soo.. How 'safe' is it to run a 2.8" on a TVS on an other wise stock engine? All cooling mods except meth, don't want to run meth... OK with a conservative tune, or is that insta piston & head gasket death? Think I'll be OK so long as I keep an eye on IAT2's and KR?
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Old 06-23-2010, 11:35 AM
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Originally Posted by csementuh View Post
Soo.. How 'safe' is it to run a 2.8" on a TVS on an other wise stock engine? All cooling mods except meth, don't want to run meth... OK with a conservative tune, or is that insta piston & head gasket death? Think I'll be OK so long as I keep an eye on IAT2's and KR?
Its perfectly fine on a very conservative tune...

But your car wont make any power because you will only be able to run 15-16 degrees of timing. If you try to run more timing your car will knock like Jehovah's Witness.
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