158.32whp/157.2tq @ 8psi - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 08-18-2007, 05:16 PM   #1
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default 158.32whp/157.2tq @ 8psi

My previous pull running 6psi that I posted in a previous thread.
Name:  DSC00282.jpg
Views: 4
Size:  58.7 KB

My new dyno graph done today. Only changes are the FMIC and 8psi.
Name:  DSC00821.jpg
Views: 5
Size:  48.5 KB

It would have made good power if I didn't have the over-fueling issue. The tq curve is hard to see, but it hits peak tq where the whp curve flattens out. I have the 8:1 and 6:1 discs for the Vortech and hopefully will do some "tuning" today to get rid of that.
ray_sir_6 is offline   Reply With Quote
Old 08-18-2007, 05:29 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,865
Total Cats: 1,790
Default

you need a helper spring....your boost is dropping off a few psi isn't it?
Braineack is offline   Reply With Quote
Old 08-18-2007, 05:38 PM   #3
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

No, it's running so much fuel it's killing it. It runs 8psi from 4k up to redline, but the A/F goes 10:1++++ there, too.
ray_sir_6 is offline   Reply With Quote
Old 08-19-2007, 03:41 PM   #4
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

yeah the 6-1will help abit also maybe turning up abit of boost up top would'nt hurt either
magnamx-5 is offline   Reply With Quote
Old 08-19-2007, 03:50 PM   #5
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

I put in the 8:1 for now. Runs a little better.
ray_sir_6 is offline   Reply With Quote
Old 08-19-2007, 04:10 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,865
Total Cats: 1,790
Default

mine used to do the same (+10:1) but i never saw a drop of torque like that, which is indicitive of the greddy wasetgate failing to hold boost to redline.
Braineack is offline   Reply With Quote
Old 08-19-2007, 09:44 PM   #7
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

teh boost gauge shows stead boost from 4100 till redline. I put in the new disk and I can tell it pulls longer, but still has the flat spot on top. It used to do it around 5k-5.5k, where you can feel it stop pulling hard, and now it goes to around 6k. I won't get another chance to dyno till I get the Haltech, so that's all I have to go on till I do the jump to "way too fast".
ray_sir_6 is offline   Reply With Quote
Old 08-20-2007, 09:24 AM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,865
Total Cats: 1,790
Default

I bet if you logged your boost against RPM you'd be surprised....look at your first plot on how well it handled the boost....there is not a significant torque drop, and as a result to HP increases to redline.

On your second plot, only running 2 more psi in the intake manifold, your torque drops below 100 at 7000RPM....less than the previous results.

I don't need to watch your gauge to tell you that your boost is spiking and droping. You can see it in the torque curve....it spikes and then drops like crazy....mathematically, if your turbo maintained the boost pressure to redline, then the curve of the TQ/HP would look very similar to your previous plot, only up the axis a bit. And as a reuslt of the boost drop, instead of making your peak torque and holding it untill 6K, it drops off instantly, and your HP fails to rise as it should.

Let's say your torque only dropped around 25tq from the peak at redline, as it should, then your HP would actually be 175 at 7000RPM.

Just think about it, you increased your peak torque by 31TQ with 2psi, however, your peak HP only increased 12HP......something about that doesnt seem odd to you?
Braineack is offline   Reply With Quote
Old 08-20-2007, 10:01 AM   #9
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

You're ******* dense dude. Boost spike and droop, no question. If you work at a shop, then you should know that your mechanical boost gauge sucks *****, and you should have hooked up the dyno's sensors to capture telemetry. How many seconds does it take to add the MAP/Temp sensor so you can plot accurate data?

Here's a couple of my own graphs. "dotted" plot represents manual boost control, spike and droop. Looks like your plot doesn't it? Just higher up.
Solid plot represents EBC helping with the shitty wastegate actuator. Which is what Brainy is trying to explain to you.

I don't remember any of the numbers anymore, but the MBC graph was something stupid like 16psi spike falling to 10psi or something. The solid graph is 14psi falling to 13psi.
Ben is offline   Reply With Quote
Old 08-20-2007, 04:28 PM   #10
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

Quote:
Originally Posted by Ben View Post
You're ******* dense dude. Boost spike and droop, no question. If you work at a shop, then you should know that your mechanical boost gauge sucks *****, and you should have hooked up the dyno's sensors to capture telemetry. How many seconds does it take to add the MAP/Temp sensor so you can plot accurate data?

Here's a couple of my own graphs. "dotted" plot represents manual boost control, spike and droop. Looks like your plot doesn't it? Just higher up.
Solid plot represents EBC helping with the shitty wastegate actuator. Which is what Brainy is trying to explain to you.

I don't remember any of the numbers anymore, but the MBC graph was something stupid like 16psi spike falling to 10psi or something. The solid graph is 14psi falling to 13psi.

Wow. That does look alot like mine. I might be wrong. I'll get Brice to look at it when he gets back this week. Then we can fix it and I'll have a new plot (hopefully).
ray_sir_6 is offline   Reply With Quote
Old 08-20-2007, 04:53 PM   #11
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,865
Total Cats: 1,790
Default

search "helper spring" on here, it's an easy "fix" You'll be happy with the results.
Braineack is offline   Reply With Quote
Old 08-20-2007, 05:54 PM   #12
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

I already looked into that a few weeks ago. I was having boost issues, where it would not hit full boost till 5500rpm. I pulled off the heatshield and found the problem...my turbo blanket was holding the WG open.
ray_sir_6 is offline   Reply With Quote
Old 08-20-2007, 05:56 PM   #13
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,865
Total Cats: 1,790
Default

that's no fun. It still looks like it spools a tad late....looks like 5K? still have a stock DP and exhaust?
Braineack is offline   Reply With Quote
Old 08-20-2007, 06:07 PM   #14
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

Quote:
Originally Posted by ray_sir_6 View Post
.my turbo blanket was holding the WG open.
Mmm, turbo blanket...I want one
Atlanta93LE is offline   Reply With Quote
Old 08-20-2007, 07:10 PM   #15
Junior Member
 
Join Date: Jan 2005
Location: San Jose, CA
Posts: 248
Total Cats: 0
Default

Ray can you please post your setup? I hate looking at dynos without knowing whats under the hood!
medisyn is offline   Reply With Quote
Old 08-20-2007, 08:22 PM   #16
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

Greddy Kit, FMIC, MBC, MSD BTM, JR Inj Controller, Tony 2.5" DP, 2.5" exhaust, Votech 10:1 disc, 8psi.
ray_sir_6 is offline   Reply With Quote
Old 08-20-2007, 08:23 PM   #17
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

Quote:
Originally Posted by Atlanta93LE View Post
Mmm, turbo blanket...I want one
$100 plus shipping.

817-860-4300
ray_sir_6 is offline   Reply With Quote
Old 08-29-2007, 06:51 PM   #18
Guest
Thread Starter
iTrader: (1)
 
ray_sir_6's Avatar
 
Join Date: Dec 2006
Location: DFW, TX
Posts: 714
Total Cats: 0
Default

Well, did a little tweaking this week. After a few 2d gears pulls to redline I did notice it was dropping to 5.5psi at redline. It would do fine unless you went WOT, where it would hit 8psi and then immediately start falling to WG spring pressure by redline.

I decided to do a "helper spring", so I went to Lowe's and bought 6 different spring rates and went to work. They did ZERO to fix the problem. All I got was higher max boost and it would still fall to 5.5psi @ redline. After wasting 3 days trying to get that to work, I installed my Begi. That was last night, and now I get a peak to about 9psi, holds steady at 8psi to redline. I now have alot of springs I do not need and alot of wasted time trying to make them work.

On a good note, my A/F sits between 11:1 - 10:1 under boost till 6psi, where it drops to 13:1 - 14:1 area for a split second, then moves between 12:1 and 10:1. That drop in A/F is where the AFPR starts to fall off and the Inj Controller kicks in. I am working on tuning that drop out with the Begi, but I have only been tweaking it since last night.

Cliff Notes: OVERFUELING caused boost loss, helper spring did NOTHING. Begi was the fix.
ray_sir_6 is offline   Reply With Quote
Old 05-20-2008, 09:19 PM
getinfgoo
This message has been deleted by Braineack. Reason: Spam Bot
Old 05-20-2008, 09:23 PM
Fireindc
This message has been deleted by Braineack. Reason: clean up.
Old 05-20-2008, 09:33 PM
samnavy
This message has been deleted by Braineack. Reason: clean up.
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Miata new person and a what's it worth! Model192 Meet and Greet 16 09-29-2015 09:50 PM
WTB: PNP injectors for NA (92) Besusjesus WTB 2 09-01-2015 10:19 AM
12psi 1.6 Greddy Dyno vs 8psi 1.8 Begi S3 mx5dude69 Dynos and timesheets 7 01-25-2009 03:33 PM
New Greddy kit running 8psi??? jim-NA E-Manage 8 08-24-2007 12:58 PM
The difference between 5 and 8PSI miatamad DIY Turbo Discussion 10 12-13-2006 11:26 AM


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 11:28 AM.