Before and after dyno runs (NA 1.6L car) - 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 09-21-2008, 06:10 PM   #1
Newb
Thread Starter
 
Join Date: Dec 2007
Location: UK
Posts: 23
Total Cats: 0
Default Before and after dyno runs (NA 1.6L car)

I've always (well not quite!) wanted to see what difference a MSPnP without AFM made, compared to a stock ECU. I searched this forum and others without positive evidence...

If you're also curious about the answers to this question, read on!

The condition of the experiment were as follows:

- A 1993 (1.6l) NA car (Californian spec, thus with sequential injection when using the stock ECU)
- Randall CAI, stock air box bottom and air filter, TunerToy dual fuel rail, stock injectors, new plugs (some of this is probably irrelevant, but provided in the interest of science)
- Original exhaust but with high flow 2.5" metallic core cat
- Upgraded 1.6L clutch and torsen diff from a 1994 car, sticky tyres (185/60/14 Yokohama AO48)
- Same fuel (Euro 98)
- Same high precision MAHA dyno at the same shop (but measurements were taken with nearly two month of interval)

The dyno run on the second page of the attachement is based on the stock ECU and AFM, with timing bumped to 14degs BTDC... resulting in a whooping 84 BHP at the wheels, 96 lb.ft of torque (presumably at the crank)... and fairly low measured transmission losses (34 BHP).

The dyno runs on the first page are based on a MSPnP 9093, without AFM (I removed the AFM and top of the stock air box, and replaced this assembly with the MAF and air box cover from a 1.8L 94 car, which is supposedly less restrictive. I also drilled the air box cover to mount a GM IAT sensor in it)

There are two traces for torque and engine power on the first page. The thinner ones are with the default timing map, and the Thicker ones -slightly higher, especially at low rpms- are after tuning on a steady state rolling road (Timing was advanced by about 3-4 degrees at WOT)

Peak HP wasn't better with the MSPnP (82 BHP), but torque was significanlty better (106 lb.ft at best, and a much flatter curve, especially after tuning).

I'm a little bit perplexed by the change in Drag power as the setup was identical (yes, the tires were almost new when these measurements were taken, as opposed to almost worn in the other page), but this won't change the conclusions (whp is what mattters).

This is not quite what I expected on the peak HP front, but the torque gain an average whp gain of 5 BHP up to 6500 rpms are still nice to have...
Attached Files
File Type: pdf NA1.6_dyno_results_(MSPNP_and_stock_ECU).pdf (106.4 KB, 442 views)
Eiffel is offline   Reply With Quote
Old 10-02-2008, 12:08 AM   #2
jcd
Newb
 
Join Date: Oct 2008
Posts: 1
Total Cats: 0
Default

Way cool information. I'm working on the logistics of an SCCA STS2 NA and this was a great find. Previously I'd gone through the same steps with a stock C4 corvette and ended up having the car dyno'd myself because the info just wasn't there. I was very happy to find this. Thanks for the report, I've got some learning to do!
jcd is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
91 1.6l turbo complete part out. Tony the Tiger Miata parts for sale/trade 63 12-29-2016 03:23 AM
1.8, C30-74 Rotrex, 9psi, 235WHP/190WTQ (E85) Lincoln Logs Dynos and timesheets 4 09-23-2015 01:26 PM
1991 Turbo Miata partout tottestad Miata parts for sale/trade 18 09-14-2015 08:52 PM
Mystery Engine Trouble. Halp, mt.net! vehicular General Miata Chat 12 09-14-2015 04:17 PM
ME221 Now has Autotune and Long Term Fuel Trim Tables Motorsport-Electronics ECUs and Tuning 0 09-05-2015 09:02 AM


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 04:50 PM.