blitz_ctr

im hoping this is in the right section, i was wondering which is better for a 90 civic sedan with the stock d15 and 5 spd, a b18a1 or some sort of ghetto rigged turbo set up, i already have a donor car for the b swap, but what all would i need? and what kind of turbo setup would give me decent power without having to worry about detonation? any help would be appreciated...thanks

imported_italstallion

well what are your goals in terms of power the b18a would be slower compared to a turbo-D but if your going to upgrade later on then i would say start off with the b18 then turbo it later on when funds permit.

blitz_ctr

im looking for maybe 150 whp, with small mods

chris_si98

wait.. are you saying which motor is better to turbocharge? or if a b18a is a better choice than a booste d?

blitz_ctr

if a b18a is a better choice then a boosted d

maca

wouldnt he just blow a boosted D

imported_Fug

no

blitz_ctr

hmmmm, this whole detonation thing sounds a bit risky.......

chris_si98

colder plugs, retard timing, good gas. And you most likely won't get any.

imported_bevboyy

Dont forget - lower boost. Unless you rebuild your block with forged internals (pistons, crank, connecting rods) you have no business running anything over 9psi - unless you love to tow your car and waste tons of cash rebuilding your motor.

chris_si98

I'm sorry your wrong.

9 psi is different on every set-up, even if the turbos are the same.

You shoulf of said the stock block can take 220-230whp when tuned properly.

I plan on running 10 pounds in the summer on my stock block but since I have a small t25 it's not going to be making any serious numbers over 230

imported_bevboyy

Hmm. If the originating poster had a minty fresh block - maybe, but I doubt it. Hondas crank and rods and pistons are not really built to handle the task - period. He's just looking at making 150-160 hp. So he should use a small turbo (ihi 5rhb or T25 etc..) and use the stock internal wastegate (usually set at 7 to 8 psi) in order to keep his motor in ONE piece. Cast pistons really do not handle boost all that well.

Most guys literally slap on a turbo set up before making sure the engine is worthy of handling boost. A stock d15 is 9.1:1 compression - so that in itself is an issue. So lets see - high compression + non forged internals + higher boost = recipe for trouble.

Sure you can run higher boost - but you also run the greater risk of destroying your motor and loosing all that cash you throw into it - RIGHT? Then we'll see that same turbo set up back here on the classifieds in a few months....

Remember - he'd probably be using stock CAST internals......

All that being said, IF you prep your engine properly, and run moderate boost (and maintain a VERY VIGIL EYE on your air/fuel ratio - a lean condition you really, really want to avoid...) you will get decent HP increase and your engine should last. And I think that is what the orginating poster would prefer.

I'm not saying you can't make 200+ hp, on stock internals, but seeing that alot of people on the board don't have lots of excess coinage to spend on rebuilding their blocks, moderation is key here.

I run 15 psi daily - but then my block came from the factory with forged internals, hardened seats and valves. All SVO/TurboCoupe engines came like that. With Gillis valve installed I can run easily 18-19 psi with NO adverse effects (except fuel consumption), and the motor will last another 100k.