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Bluetop on turbo
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09-16-2016, 09:43 PM
Post: #1
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Bluetop on turbo
Hi there, on my slow turbo bluetop project, i was planning on stay all stock and run it low bost 5/6 psi max. But the other day i,ve realised i have a tiny coolant leak between head and block, closest area to firewall and its probably to take out head to repair it.
On the way i was thinking on place a thicker head gasket to reduce compression so i can increase psi on turbo. How much bar ps psi can i run with stock internals and dropped compression? Where can i find a thicker head gasket to drop compression to 8 or so to 1? Cheers |
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09-17-2016, 08:37 AM
Post: #2
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Bluetop on turbo
Lowering the comperssion is the cheap way to do a turbo build. Our engines already have a low compression compared to modern standarts so why dropping it even further? I would change the hg and run more boost with the 9.4:1 cr a stock laregport delivers.
I would target arround 10-12psi on a stock motor. Daily Beater: Civic EG5 Work in progress Car: AE86 |
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09-18-2016, 09:57 PM
Post: #3
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Bluetop on turbo
Thanks a lot for the answer mate. Sorry but what does hg means? I thougt bluetop bigport was arround 10:1 cr.
Is oe head gasket enough for this kind of spec? Cheers |
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09-19-2016, 12:42 PM
Post: #4
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Bluetop on turbo
HG= headgasket
 Seen serval builds with the OEM headgasket wich seem to last with no problem. 9.4:1 or 10:1cr depends on the market the car was sold. But a rule of thumb for the EU market is if your car was equipped with a catalytic converter from the factory you got a 9.4:1 motor if not it is 10:1. But even 10:1 isn't a problem if the tune is done right. Daily Beater: Civic EG5 Work in progress Car: AE86 |
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09-20-2016, 12:20 AM
Post: #5
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Bluetop on turbo
I see. Mine came from sweedzeland and it has no catalic converter. For the tunning i also have an hks fcon from that era, with the gcc module for a fine tune. I have to add a wideband gauge to know im doing it right.
Im looking for the best cheap reliable one...i doesnt matter if i is a kit to solder myself. Any sudgestion? Thanks a lot for all the advices Cheers |
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09-20-2016, 12:22 PM
Post: #6
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Bluetop on turbo
If the car is from Switzerland it's got an AFM and 9.4:1 pistons, regardless if there's a CAT or not
AE86 ex-daily |
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09-20-2016, 12:56 PM
Post: #7
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Bluetop on turbo
Yea should have mentioned that AFM/MAP also difference the CR.
Not a big fan of piggybacks, for little more you can go standalone (Megasquirt PNP). For the wideband I would go with a known Brand like AEM, PLX, Inovate... Daily Beater: Civic EG5 Work in progress Car: AE86 |
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09-20-2016, 09:17 PM
(This post was last modified: 09-21-2016 09:00 PM by leon205gti.)
Post: #8
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Bluetop on turbo
It is afm And non cat. What woud be the safe turbo preassure i should achive with this kind of old stuff (hks piggyback) reliably?
I dont expect huge amount of power, just a bit more and some torquey so i can make my 185/55/15 rears spin on dry tarmac Cheers |
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