Need...more...brainpower (help me get my build running plz) - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-05-2011, 03:49 AM   #21
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,638
Total Cats: 25
Default

It needs to be above what your cranking, when the car fires it jumps up maybe a hundred rpm for a split second on just a single kick, this tell MS that its kicked and starts tapering off the cranking fuel enrichment etc. So it needs to be say, 50 rpm higher than the actual cranking rpm, otherwise it will put in the amount of fuel to run, not start.

Dann
nitrodann is online now   Reply With Quote
Old 07-05-2011, 08:11 AM   #22
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Quote:
Originally Posted by nitrodann View Post
It needs to be above what your cranking, when the car fires it jumps up maybe a hundred rpm for a split second on just a single kick, this tell MS that its kicked and starts tapering off the cranking fuel enrichment etc. So it needs to be say, 50 rpm higher than the actual cranking rpm, otherwise it will put in the amount of fuel to run, not start.

Dann
I am pretty sure that is how it is set up but I'll double check.
astroboy is offline   Reply With Quote
Old 07-05-2011, 09:32 AM   #23
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

you're seeing RPMS in tunerstudio, and getting fuel and spark in the engine?

can't look at MSQ right now, but yes, cranking RPM should be around 350-400.
Braineack is offline   Reply With Quote
Old 07-05-2011, 09:39 AM   #24
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Quote:
Originally Posted by Braineack View Post
you're seeing RPMS in tunerstudio, and getting fuel and spark in the engine?

can't look at MSQ right now, but yes, cranking RPM should be around 350-400.
Yup, yup, and yup. From what I remember my cranking rpm's were ~250rpms which then dropped to ~150rpms. Maybe weak battery is making ***** spark that gets blown out by fuel?
astroboy is offline   Reply With Quote
Old 07-05-2011, 09:53 AM   #25
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

Make sure the throttle calibration is not getting you into flood clear mode. in fact, you may want to unplug the tps connector while you figure it out. You may be able to lock the injectors wide open if not hooked up properly.

and stock injectors? what's your req_fuel number?
Braineack is offline   Reply With Quote
Old 07-05-2011, 10:46 AM   #26
Junior Member
iTrader: (3)
 
Join Date: Jul 2008
Location: Pinellas park Fl
Posts: 308
Total Cats: 1
Default

For the third time, spray some starter fluid in the throttle body and see if she comes to life. That will confirm or eliminate a fueling issue.
92Miata is offline   Reply With Quote
Old 07-05-2011, 10:58 AM   #27
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

who does that?
Braineack is offline   Reply With Quote
Old 07-05-2011, 10:58 AM   #28
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Quote:
Originally Posted by Braineack View Post
Make sure the throttle calibration is not getting you into flood clear mode. in fact, you may want to unplug the tps connector while you figure it out. You may be able to lock the injectors wide open if not hooked up properly.
I was attempting to start it with the tps unplugged for a bit, I set it to mapdot till I can locate the problem with the tps.

Quote:
Originally Posted by Braineack View Post
and stock injectors? what's your req_fuel number?
The injectors are ID1000's, don't recall required fuel.
astroboy is offline   Reply With Quote
Old 07-05-2011, 11:03 AM   #29
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Quote:
Originally Posted by 92Miata View Post
For the third time, spray some starter fluid in the throttle body and see if she comes to life. That will confirm or eliminate a fueling issue.
I really just want to figure out the problem and fix it seeing how the engine hasn't been started. Seeing how the fuel pressure gauge on the fpr is showing 0psi I think after timing that is the most logical place to look. I do appreciate the offering of advice though.
astroboy is offline   Reply With Quote
Old 07-05-2011, 11:04 AM   #30
Junior Member
iTrader: (3)
 
Join Date: Jul 2008
Location: Pinellas park Fl
Posts: 308
Total Cats: 1
Default

Quote:
Originally Posted by Braineack View Post
who does that?

A motor takes 3 things to run, spark, air, and fuel, correct ?

So if he has air, and spark, but he's not sure he's getting fuel then the simplest way to see if fuel is the issue is to add fuel.

If he sprays starter fluid in and it runs then he knows he needs to trouble shoot the fuel system it's much quicker then troubleshooting to find out the fuel system is working right and he has some other issue.
92Miata is offline   Reply With Quote
Old 07-05-2011, 11:04 AM   #31
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

you need a req_fuel value of like 2.0ms. I'm betting you're flooding the motor if you didn't account for that.
Braineack is offline   Reply With Quote
Old 07-05-2011, 11:08 AM   #32
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Hmmmmmmm, I thought I saw a value of 3.6 but I also don't have mt/ts so I can't verify that.
astroboy is offline   Reply With Quote
Old 07-05-2011, 11:19 AM   #33
Junior Member
iTrader: (3)
 
Join Date: Jul 2008
Location: Pinellas park Fl
Posts: 308
Total Cats: 1
Default

Yea yours is 3.5 or 3.6, I would still expect some kind of sputter from it before it completely flooded ?

You stated before that you didn't trust that fuel gauge so I ignored that factor. If you trust it you need to start looking for why and the fuel pump asembly is a good start.
92Miata is offline   Reply With Quote
Old 07-05-2011, 11:30 AM   #34
Junior Member
iTrader: (3)
 
Join Date: Jul 2008
Location: Pinellas park Fl
Posts: 308
Total Cats: 1
Default

Wait your running a 99 motor and all 99 sensors in a 90-97 chassis ?

The wiring for the 99 sensors is a lot diffrent, I had to re wire for the coolant sensor and ended up just running new wires for the tps.

I'm running a 99 motor in a 94 chassis on ms2 with 94 coils and cas. 99 temp sensor(3 wire vs 94 2 wire) 99 tps, 99 injectors and harness.
92Miata is offline   Reply With Quote
Old 07-05-2011, 11:37 AM   #35
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

Do your coolant, MAP, and MAT readings look logical for a cold engine?
curly is offline   Reply With Quote
Old 07-05-2011, 11:37 AM   #36
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Quote:
Originally Posted by 92Miata View Post
Yea yours is 3.5 or 3.6, I would still expect some kind of sputter from it before it completely flooded ?

You stated before that you didn't trust that fuel gauge so I ignored that factor. If you trust it you need to start looking for why and the fuel pump assembly is a good start.
When I get home I am going to make a small system loop that goes: pump/tank-fpr-verified pressure gauge-tank. I really don't want to dick around with the fpr in the bay because there is so little room to work in there.

Quote:
Originally Posted by 92Miata View Post
Wait your running a 99 motor and all 99 sensors in a 90-97 chassis ?

The wiring for the 99 sensors is a lot diffrent, I had to re wire for the coolant sensor and ended up just running new wires for the tps.

I'm running a 99 motor in a 94 chassis on ms2 with 94 coils and cas. 99 temp sensor(3 wire vs 94 2 wire) 99 tps, 99 injectors and harness.
I rewired for the 99 tps and iacv, still using both '90 cts, and the 90 injector harness with the ID1000's (with the plug adapters from 949). Also running cops.
astroboy is offline   Reply With Quote
Old 07-05-2011, 11:41 AM   #37
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Quote:
Originally Posted by curly View Post
Do your coolant, MAP, and MAT readings look logical for a cold engine?
Yes they do. Last nite they were approximately 76 Wait, there should be a temp associated with MAP?
astroboy is offline   Reply With Quote
Old 07-05-2011, 11:43 AM   #38
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

air temp, coolant temp, and manifold pressure.
curly is offline   Reply With Quote
Old 07-05-2011, 11:46 AM   #39
Elite Member
Thread Starter
iTrader: (18)
 
Join Date: Dec 2007
Location: oahu
Posts: 1,720
Total Cats: 2
Default

Well the air and coolant temps looked correct and the manifold pressure didn't do anything special as far as I remember.
astroboy is offline   Reply With Quote
Old 07-05-2011, 11:49 AM   #40
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

Blow on the MAP signal line, see if it changes. I'm pulling easy ideas out of my *** at this point, not sure if you've tried it.
curly is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 12:39 AM.