Can't get top end boost with stock air box
#1
Can't get top end boost with stock air box
Hey
Does the stock air box restrict boost at top end with a 3" dowpipe, midpipe and catback? Car is very quick off the line but lags in boost at top end, and i'm thinking it's the stock air box restricting it. Would intake help keep the turbo's running strong at top end?
ps. mods in the signiture.
-Marshall
Does the stock air box restrict boost at top end with a 3" dowpipe, midpipe and catback? Car is very quick off the line but lags in boost at top end, and i'm thinking it's the stock air box restricting it. Would intake help keep the turbo's running strong at top end?
ps. mods in the signiture.
-Marshall
#2
Tony Stewart Killer.
iTrader: (12)
you have no ecu? I think the marvelspeed port will probably require one unless they told you otherwise. And yeah I think an intake will make a fair amount of difference just watch the boost levels. Your car with the port and exhaust should be pulling harder and boost increasing if anything at higher rpms.
#5
what kind of plug in play ecu would yall recogmend?
http://www.rx7store.net/product.asp?0=208&1=297&3=632
http://www.rx7store.net/product.asp?0=208&1=297&3=632
Last edited by mrb63083; 03-25-04 at 10:10 AM.
#6
Cheap Bastard
iTrader: (2)
The stock intake is very restrictive. I suggest that you install a boost controller before you open up the intake. With a boost controller, you can limit your boost to 10, and keep your stock ECU. Here is a thread on a nice mod to the stock airbox.
https://www.rx7club.com/forum/showth...hreadid=121491
#7
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Originally posted by mrb63083
what kind of plug in play ecu would yall recogmend?
http://www.rx7store.net/product.asp?0=208&1=297&3=632
what kind of plug in play ecu would yall recogmend?
http://www.rx7store.net/product.asp?0=208&1=297&3=632
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#8
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Now, this is kind of a touchy situation.
What I have found, on more than one system, is the fact that the primary intake elbow closes up when it gets hot and the turbo spools up.
Some people have gone through $1000's trying to correct a problem which isn't. My advice to you is go through the engine comp. and make sure everything is to spec. After that, then look at your mods to see if correct installation has been done.
You might just find you have a leaking one way valve or split hose.
Just my 2 cents.
Adam
What I have found, on more than one system, is the fact that the primary intake elbow closes up when it gets hot and the turbo spools up.
Some people have gone through $1000's trying to correct a problem which isn't. My advice to you is go through the engine comp. and make sure everything is to spec. After that, then look at your mods to see if correct installation has been done.
You might just find you have a leaking one way valve or split hose.
Just my 2 cents.
Adam
#10
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The rubber elbow on the stock primary turbo will collaps at times when the elbow gets hot and the turbo is pulling a large ammount of air. Kind of like drinking a milkshake through a soda straw. Try to drink too fast and the straw collapses.
#11
Rotary Enthusiast
Originally posted by SBi_Owner
The rubber elbow on the stock primary turbo will collaps at times when the elbow gets hot and the turbo is pulling a large ammount of air. Kind of like drinking a milkshake through a soda straw. Try to drink too fast and the straw collapses.
The rubber elbow on the stock primary turbo will collaps at times when the elbow gets hot and the turbo is pulling a large ammount of air. Kind of like drinking a milkshake through a soda straw. Try to drink too fast and the straw collapses.
for rubber 'pipes' that will not collapse (or heatsoak), with full flow area:
mcmaster carr 53335K12 metal reinforced hose, 60mm.
$4 per foot.
#12
Cheap Bastard
iTrader: (2)
Originally posted by SBi_Owner
The rubber elbow on the stock primary turbo will collaps at times when the elbow gets hot and the turbo is pulling a large ammount of air. Kind of like drinking a milkshake through a soda straw. Try to drink too fast and the straw collapses.
The rubber elbow on the stock primary turbo will collaps at times when the elbow gets hot and the turbo is pulling a large ammount of air. Kind of like drinking a milkshake through a soda straw. Try to drink too fast and the straw collapses.
I designed a nice mod for the stock airbox, that will eliminate that situation you described:
https://www.rx7club.com/forum/showth...hreadid=121491
#13
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the "elbow" he refers to is known as an intake pipe or hard pipe. connects the airbox to the turbo.
it is doubtful that your boost situation is being caused by the stock airbox.
what do you mean by "lags in boost"? what is your boost pattern? you do have a boost gauge don't you?
it is doubtful that your boost situation is being caused by the stock airbox.
what do you mean by "lags in boost"? what is your boost pattern? you do have a boost gauge don't you?
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