What are 460's good to? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 08-10-2007, 07:15 PM   #21
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

Quote:
Originally Posted by Ben View Post
nope. i was also assuming well tuned.
whats that td04 I cant hear you over my spoolin tdo5
magnamx-5 is offline   Reply With Quote
Old 08-10-2007, 07:28 PM   #22
Senior Member
iTrader: (2)
 
Join Date: May 2007
Location: Malibu, CA
Posts: 749
Total Cats: 0
Default

Quote:
Originally Posted by airbrush1 View Post
on my 1.8, I did 260 wheel at 12psi on RX7 460's..... don't remember the duty cycle, but we had plenty of injector left
Was that still with stock fuel pressure/pump?

Not trying to thread jack, but thats right where I want to be (hp wise) and I'm thinking that 460's sound right.
speedf50 is offline   Reply With Quote
Old 08-10-2007, 07:32 PM   #23
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

you should be fine at that level if ben can do it on a 1.6 and airbrush on a big turbo 1.8 then it will work for you as well.
magnamx-5 is offline   Reply With Quote
Old 08-10-2007, 07:36 PM   #24
Senior Member
iTrader: (2)
 
Join Date: May 2007
Location: Malibu, CA
Posts: 749
Total Cats: 0
Default

But are both of them running stock fuel pressure and pumps?
speedf50 is offline   Reply With Quote
Old 08-10-2007, 07:41 PM   #25
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

No I have an upgraded fuel pump, walbro 190lph hp, which probably helps keep fuel pressure steady better than the stocker could. I'm well under 80% IJDC at my power, rarely get to 72% or so on the street.

not sure what would be lost with a standard pump.
Ben is offline   Reply With Quote
Old 08-10-2007, 07:45 PM   #26
Senior Member
iTrader: (2)
 
Join Date: May 2007
Location: Malibu, CA
Posts: 749
Total Cats: 0
Default

We need braineack or someone who isn't lazy like me to figure out the flow requirements of the 460's at that power, and the stock pumps flow in comparison.
speedf50 is offline   Reply With Quote
Old 08-10-2007, 08:36 PM   #27
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

the stock pump can flow 300BHP at 50psi....so if you arent making more than that, a new pump isn't needed...unless it's crapping out.


here's a good resource for the lazy: http://www.megamanual.com/v22manual/minj.htm
Braineack is offline   Reply With Quote
Old 08-10-2007, 09:04 PM   #28
Senior Member
iTrader: (2)
 
Join Date: May 2007
Location: Malibu, CA
Posts: 749
Total Cats: 0
Default

Sweet thanks for the info. 460's sound like a good bet for 250whp.
speedf50 is offline   Reply With Quote
Old 08-10-2007, 09:16 PM   #29
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

of course, that's assuming the stock pump holds 50psi at high map through red line. A fresh pump, probably no problem. From what I see, some--even most--do, but others don't. These things are getting pretty old now.

The stock pump in an NB can NOT hold 60psi (NB's run 60-63 static) in high map, high rpm situations.
Ben is offline   Reply With Quote
Old 08-10-2007, 10:40 PM   #30
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Quote:
Originally Posted by Ben View Post
The stock pump in an NB can NOT hold 60psi (NB's run 60-63 static) in high map, high rpm situations.
Do you know how much they drop off?
cjernigan is offline   Reply With Quote
Old 08-10-2007, 10:42 PM   #31
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

ask POPSTOY :gay:

according to him it drops to like 40psi or something really low...he's convinced the only cure is a 255lph pump as he saw the same with a 190lph, but I'd take that with a grain of salt.
Braineack is offline   Reply With Quote
Old 08-10-2007, 10:47 PM   #32
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default


I'd say invest the $20 in a fuel pressure gauge, but really I'd just put that $20 towards the $80 a new pump costs. But since you run a MS, I also assume you have a full time wideband. So you'll know if you need a better pump or not.

People here tend to get pretty hung up on fuel pressure. I don't give a rat's A what the fuel pressure is, as long as my chambers get their fuel.
Ben is offline   Reply With Quote
Old 08-11-2007, 08:56 AM   #33
jif
Junior Member
 
Join Date: Mar 2007
Location: Auckland, NZ
Posts: 49
Total Cats: 0
Default

460's come with some of the Subaru EJ20T's ... so you know they're good for at least 280hp at the *crank* even with a rich/retarded factory tune
jif is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:49 AM.