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Harrop Swap onto Stock LSJ

Old 03-11-2008, 09:23 PM
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Harrop Swap onto Stock LSJ

Ok, just to simplify this down for people like me who get confused reading through 70 pages of conflicting Ideas, If I ordered a TVS blower from harrop, what would I need to do to my car if it was a Bone Stock 06 Cobalt SS/SC,

What Im looking for is a detailed list of associated mods that would need to be done for the swap to function properly without shooting a connecting rod out the oil pan.
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Old 03-11-2008, 09:25 PM
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Im sure cooling mods...h/e, water meth, dual pass endplate
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Old 03-11-2008, 09:26 PM
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bigger injectors,cooling mods,exhaust mods...tvs just have more potenial over the m62
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Old 03-11-2008, 09:27 PM
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Personally I would go with full internals as well.
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Old 03-11-2008, 09:33 PM
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i dont think full internals will be necessary, from a pure torque point of view neither of the big turbo builds have fallen apart yet and they are near 400 horse. Also, the TVS is more adbiatic efficient so you wont have the same problems as the stock heaton does with high cylinder temps and detonation and all that. However, it would be recommended to do the basic cooling mods/ breathing mods. Injectors are necessary tho.
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Old 03-11-2008, 11:55 PM
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Why don't we wait until a tvs blower is bolted to a stock lsj and then see what it needs to run safely! Its only a 1 month away before we find out. Currently we don't know what it needs to run safely....nobody has one. Just wait i am sure a thread like this will be a sticky or something sooner or later. Only thing i would bank on for now would be 60lbs injectors, tune, and maybe exhaust. If this blower runs so efficient why the need for cooling mods to run the blower at the same psi or a little more?
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Old 03-11-2008, 11:57 PM
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Old 03-12-2008, 12:18 AM
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its all speculation, just wait til the testers get theirs all set up and working, it does seem like putting an extra $1000 into the engine is probably the least you could do.
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Old 03-12-2008, 12:28 AM
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Originally Posted by LopsidedJester View Post
its all speculation, just wait til the testers get theirs all set up and working, it does seem like putting an extra $1000 into the engine is probably the least you could do.
Couldn't agree more
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Old 03-12-2008, 02:34 AM
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run it on stock injectors you will be fine
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Old 03-12-2008, 02:45 AM
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If it's a direct swap onto a stock LSJ without any sort of ECU reflash then you won't need to do anything. It will simply run more efficiently than the TVS but I don't know about any performance gains if any.... maybe some because of the efficiency differences. It's not until you start increasing boost that you will need to be changing injectors etc. The ability to tune is as necessary for this as much as any fuel or cooling upgrades would be but I guess that would go without saying.... i hope.
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Old 03-12-2008, 05:24 AM
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Originally Posted by raptors_67 View Post
If it's a direct swap onto a stock LSJ without any sort of ECU reflash then you won't need to do anything. It will simply run more efficiently than the TVS but I don't know about any performance gains if any.... maybe some because of the efficiency differences. It's not until you start increasing boost that you will need to be changing injectors etc. The ability to tune is as necessary for this as much as any fuel or cooling upgrades would be but I guess that would go without saying.... i hope.
Please be clear on this ...
A direct swap onto a stock LSJ without any supporting hardware & recalibration will destroy your engine!

The HTV1320 will deliver LOTS more puff ... more fuel will be mandatory.
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Old 03-12-2008, 05:45 AM
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It really depends on what size pulley and how much boost it'll be running. Here are my suggestions:

1. Clutch
2. Cooling mods
3. Motor Mounts/Inserts
4. 60# injectors
5. Full exhaust
6. Intake
7. Proper Tune (Probably the most important part of the whole swap!)
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Old 03-12-2008, 06:00 AM
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What about pistons and rods? I'm sure I'm like many other people who have already downloaded the GM build book that states you need forged pistons to exceed 300hp. While replacing the pistons I think it would beneficial to take the time to replace the rods too. As a precaution I'd do valve springs, and possibly valves themselves, too.
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Old 03-12-2008, 06:13 AM
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Originally Posted by Harrop View Post
Please be clear on this ...
A direct swap onto a stock LSJ without any supporting hardware & recalibration will destroy your engine!

The HTV1320 will deliver LOTS more puff ... more fuel will be mandatory.
Quoted from the man himself.... most supporting mods will be required!

With the guys running 380+ hp on stock internals.... I'm sure those will be fine for a while!

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Old 03-12-2008, 11:32 AM
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you guys will have your answer by the last week of march.
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Old 03-12-2008, 11:34 AM
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yea there are 3 testers with stock engines so wait for them...they'll lead u to the promise land..refer to lsjwannabe as moses
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Old 03-12-2008, 11:37 AM
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i think thats sig material lol
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Old 03-12-2008, 11:39 AM
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lol im up to like 3 sigs...im getting good at this
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Old 03-12-2008, 11:40 AM
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well my catback will be here tomorrow, all im waiting on is that damn intake now. The blowers should be to mike tomorrow as well.
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Old 03-12-2008, 11:42 AM
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my engines going in today and cat back is getting welded up tomorrow...waiting on intake and tb spacer...and waiting on tb from witt lol
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Old 03-12-2008, 11:43 AM
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why did you run the spacer? are you using it to tap it for meth?
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Old 03-12-2008, 11:43 AM
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Originally Posted by Raven SS View Post
lol im up to like 3 sigs...im getting good at this
you are in mine
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Old 03-12-2008, 11:45 AM
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Originally Posted by lsjwannabe View Post
why did you run the spacer? are you using it to tap it for meth?
he said that the intake wont allow the bigger tb to open fully if its not used with a spacer

Originally Posted by redlineblueline View Post
you are in mine
i know...im getting good at this **** haha

Last edited by Raven SS; 03-12-2008 at 11:45 AM. Reason: Automerged Doublepost
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Old 03-12-2008, 11:47 AM
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Originally Posted by Raven SS View Post
he said that the intake wont allow the bigger tb to open fully if its not used with a spacer



i know...im getting good at this **** haha
he is lieing out of his ass.
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