Turbo B18b ?'s

96wickedteggy

Honda Mogul
Hey i was wondering is the b18b a 84 mm piston. and on a head gasket for turbo do you want a thicker gasket to lower compression?
 

8urcivic

ONLY couches pull out!!!!
no...the b20b is, the b18b is a 81mm...if u plan on alot of boost....there are other ways to lower the comprssion.
 

Ominous G2

┌∩┐(◣_◢)┌∩┐
:werd:

Its 9.2:1 which is actually perfect for boost. Most aftermarket pistons are 9:1, so you can definetly hold off on the pistons.

If you want to check different head gasket thicknesses to see if it would lower your compression, you can use this calculator. Just make sure you change everything to B18A/B first.

http://www.c-speedracing.com/howto/compcalc/compcalc.php

B20s are not good for boost, you are better off with your B18B.
 


96wickedteggy

Honda Mogul
ok well i have a 96 integra i just put on a t3/t4 and i know i need to do n fmu and some fuel mods. i didnt know if i should replace the head gasket or not. no how safe is it to run it un dyno tuned. And could i run it street tuned till i get the money or finish putting somemore bolt ons on.?
 

theshodan

Turbo Design Specialist
96wickedteggy said:
ok well i have a 96 integra i just put on a t3/t4 and i know i need to do n fmu and some fuel mods. i didnt know if i should replace the head gasket or not. no how safe is it to run it un dyno tuned. And could i run it street tuned till i get the money or finish putting somemore bolt ons on.?
Click to expand...
You're thinking of using a bandaids to keep open wounds from occurring. This is not a good approach to do this with. An FMU is not a good idea in teh slightest. Look at REAL fuel management, larger injectors, and the proper tuning done once right the first time. If you don't have the money now, just stop, think, and save. If the headgasket is fine, there is no need to change it. The stock 9.2:1 compression is more than fine for the B18B, and deptending upon which T3/T4 you have, should be a better combination.

Boost is not at all like N/A when it comes to adding components in order to gain more power. You must look 2 steps ahead when attempting to plan so that you come with the best result. It will be difficult enough to locate quirkes even with the right components and tune used. Imagine if you have the wrong setup, talk about a nightmare.
 

96wickedteggy

Honda Mogul
yeah, but i already have it on, and it would be a pain in the ass to take back off with no extra oil pan. So i have to do something to keep it going till i get the money for the tune. AND trust me if i blow the motor i dont care i have like 3 other motors sitting around.
 


96wickedteggy

Honda Mogul
yeah i dont want to pull the pans off of them due to then if i put one in something else i would have to pull another pan then if i do the same thing over again. Im shit out of luck.
 

Aussie

Zoom-Zoom
you'll be fine man, just keep the boost down and keep it running a little rich and it will be fine. I ran 3 turbo cars without having them tuned and they have all been just fine, yea they ran better and I got more power out of them when I did get them tuned but as long as you just keep it simple it will be fine.
 

8urcivic

ONLY couches pull out!!!!
this is true....but i recommend a tune....if u want it to last...spend the money and tune it.
 

dc2GS-R

Super Moderator
Keep in mind that lowering your compression of your engine by using a thicker headgasket will not be as beneficial as it may seem. It will help reduce the knock threshold but not to the extent that the compression ratio would imply. Running a thicker head gasket damn near completely eliminates the effect of the quench areas of the combustion chamber and reduces the effectiveness of it and the flow rates which it spent many man hours to engineer. It can help, but not too as much as the reduced compression ratio would lead you to believe.
 
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