A question about tuning. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 10-06-2007, 04:43 AM   #1
Senior Member
Thread Starter
 
Join Date: May 2006
Posts: 884
Total Cats: 0
Default A question about tuning.

Is a load bearing dyno an absolute must? What if I had a road that had a pretty good length with not stop signs for miles upon miles. The reason I ask is I have no idea where there is a local shop that will dyno tune my car. There's R&E racing, but they're a bunch of racist pushrod lovers... and just north of me there's a road called Baccus Road or Bacchus Road. Long, straight, no stops. I believe Reeves Callaway took one of his Vette projects out there to 223 mph and a BMW tuner I knew a while back used to do top speed runs out there. And it's pretty flat too.
firedog25 is offline   Reply With Quote
Old 10-06-2007, 04:54 AM   #2
Senior Member
Thread Starter
 
Join Date: May 2006
Posts: 884
Total Cats: 0
Default

Also, I forgot to mention I'm not looking for 250 hp and ****. Maybe between 180-210 rwhp.
firedog25 is offline   Reply With Quote
Old 10-06-2007, 10:09 AM   #3
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

Uh dude you will be just fine. just set the timming conservatively, and you will be fine.
magnamx-5 is offline   Reply With Quote
Old 10-06-2007, 11:13 AM   #4
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 406
Default

you can autotune pretty decently on a dynojet. you just wont get a lot of the map. unless you do a WOT run, then a 1/2 WOT run etc.
y8s is offline   Reply With Quote
Old 10-06-2007, 11:27 AM   #5
Supporting Vendor
iTrader: (5)
 
Join Date: Jun 2006
Location: Duluth, GA 30097
Posts: 798
Total Cats: 0
Default

You can tune fuel ok on the road with alot of time invested. You'll never get the timing right, with a TON of time invested, math, datalogging, you can get close maybe, at WOT at least. It's dangerous though....

You'll also never get the partial throttle areas of your timing map right on the road, you simply can't. It's the harder part of dyno tuning for a few reasons (time consuming, heat issues, etc) and pretty much impossible on the road.

Yes a load bearing dyno is required to do it correctly. Yes I own one, but I've been saying this for far longer and I wouldn't have spent the money if I could just do it on the street just as well....
FoundSoul is offline   Reply With Quote
Old 10-06-2007, 12:53 PM   #6
Senior Member
 
Join Date: Oct 2005
Location: Knoxville
Posts: 1,168
Total Cats: 0
Default

My car's never seen a dyno, and I'm happy with the tune. I'm sure that I could pick up a few hp with proper dyno tuning, but at $150/hr, I really doubt it would be worth it. Comparing my 1/8th mi. MPH with the other miatas on dragtimes, I'm very pleased with the power it's making.
Al Hounos is offline   Reply With Quote
Old 10-06-2007, 01:06 PM   #7
Supporting Vendor
iTrader: (5)
 
Join Date: Jun 2006
Location: Duluth, GA 30097
Posts: 798
Total Cats: 0
Default

That's just it though, it's not just about peak hp. With a proper tune, you'll have more torque all across the curve, starting as early as just off idle. And that's just talking WOT. At part throttle, where you spend much of your time driving around, the car will be smoother, more responsive, and torquier.

It's one of those things you just don't understand until you've experienced. Don't take this the wrong way, but I bet I could change your outlook on this in a very fun way, fun for you I mean .

Granted, you guys have a big help in our MSPNP base map which has an excellent timing map for an N/A car, but depending on your motor and turbo setup, you may ping like crazy with that map too, even when not in boost, it's hard to say. I just tuned Stan's SC car and it needed less timing everywhere under 100kpa compared to my N/A map, but it's spot on everywhere now and running awesome.

Last edited by FoundSoul; 10-06-2007 at 01:16 PM.
FoundSoul is offline   Reply With Quote
Old 10-06-2007, 01:12 PM   #8
Senior Member
 
Join Date: Oct 2005
Location: Knoxville
Posts: 1,168
Total Cats: 0
Default

Yeah, I'm sure you're right, but I'm just not upset enough with the car's performance to spend about $300-450 to find out how much better it could be.
Al Hounos is offline   Reply With Quote
Old 10-06-2007, 08:35 PM   #9
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,356
Total Cats: 1,322
Default

Jerry, I've played around with brake-boosting and running through each cell of the fuel map while keeping the RPM constant or damn close to it, just like I watched you do on the load bearing dyno. Any worth to doing something like that?
Savington is offline   Reply With Quote
Old 10-06-2007, 09:01 PM   #10
Supporting Vendor
iTrader: (5)
 
Join Date: Jun 2006
Location: Duluth, GA 30097
Posts: 798
Total Cats: 0
Default

Fuel, you can do OK on the street with a fair amount of time invested; spark, not so much.... And ignition is where all the power is.
FoundSoul is offline   Reply With Quote
Old 10-06-2007, 09:59 PM   #11
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,356
Total Cats: 1,322
Default

I believe it.

Jerry, have you had the opportunity to tune a car with an intercooler and water injection yet? I've been toying with the idea of adding a progressive Devil's Own kit to my setup to try and crack 250whp. I don't fancy pushing the car much past where I am now (15psi), but I know I'm leaving some timing on the table from the ****-water they call high-octane gas out here.
Savington is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
NA Seat Sliders and Seat Belt Receivers skipstr Miata parts for sale/trade 2 09-28-2015 11:53 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 09:13 PM.