how much boost?
04-05-09, 10:19 AM
#2
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
Stock boost.
More with fuel mods.
Around 8 PSI with an FCD and no other mod. Any more requires an upgraded fuel pump. Around 10 PSI you need larger secondaries and some way to control them.
But the only way to be absolutely sure is to check AFR ratios. Some cars end up leaning out well before 10 PSI. Some are rich all the way to 12.
More with fuel mods.
Around 8 PSI with an FCD and no other mod. Any more requires an upgraded fuel pump. Around 10 PSI you need larger secondaries and some way to control them.
But the only way to be absolutely sure is to check AFR ratios. Some cars end up leaning out well before 10 PSI. Some are rich all the way to 12.
04-06-09, 10:10 AM
#7
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
You will find the FSM in the FAQ sticky. It will familiarize you with the EFI system used on the RX-7.
Trending Topics
04-06-09, 07:43 PM
#8
i fought the lawn
Join Date: Apr 2009
Location: long island
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
+2, ....also, that would ring true with just about any small displacement turbo car. t3, 14b, vj12, any of em (i named a slight few of hundreds of different models of stockie snails) will turn into a hairdryer after about 1 bar. 
04-06-09, 08:41 PM
#9
Full Member
Thread Starter
Join Date: Feb 2007
Location: North Carolina
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
lol sorry i know about the efficiency ranges for turbo thats not my question. my question is how do i build the actual engine for it. are their low compression rotors? if so where do i find them, better seals? etc
04-07-09, 12:32 AM
#10
Hide the pinball machine
iTrader: (2)
Join Date: Aug 2007
Location: Sammamish, wa
Posts: 461
Likes: 0
Received 0 Likes
on
0 Posts
it would be better to know your horsepower goals, not boost goals. Same boost will create different power with different turbos, and I think it's been established that you want more than the stock turbo can handle.
04-07-09, 08:51 AM
#11
Engine, Not Motor
iTrader: (1)
Join Date: Feb 2001
Location: London, Ontario, Canada
Posts: 29,789
Likes: 0
Received 108 Likes
on
91 Posts
Telling us how much power you are looking for and the intended use for the car is a bit critical to receive good advice.
When you get into high boost levels like around 20 PSI, pump gas becomes a bit of a liability. Proper intercooling and some kind of chemical cooling (ie. meth injection) is necessary to maintain reliability.
Thread
Thread Starter
Forum
Replies
Last Post
Shainiac
Single Turbo RX-7's
12
07-17-19 02:20 PM
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM