Big Slice of Reality Pie., 2056 D-jet Dyno run Options

[Olympic 914]

Just got back from having the teener run on a Dyno.

Good and not as good as I expected.

Was hoping for at least 100 Hp, didn't make it.

This run was on a Mustang Dyno, allegedly a Dynojet Dyno reads from 12~15% higher.

First the good.

Runs were extremely consistent. the three runs printed pretty much right on top of each other.

Torque was way up there above 95 tq from 3000 to 4500. with no real dips.

HP numbers were very consistent with a nice smooth line from 2000 to over 4500

Now the bad

Max HP was only read at 88 Hp and max torque was 100.

If I add the 12-15% it comes to 100 Hp. But it is what it is.

Build is

2056 D-jet, Heads by HAM RS+, 8.6 comp. Raby 9590 cam, SS HEs with Triad muffler. I Have adjusted the MPS to what seems to run best for this car.

This car runs great and I just wanted to know what it was putting out, Not really planning to try to tune it for more power. Reliability is the key. and I am so far happy with that.

Dyno sheet added (Date/time is wrong, 5/06/21 8:35am)

[Mark Henry]

I have a real hard time believing that an EFI system on it's own gave any kind of a HP increase let alone a claimed almost 20%.

You're claiming that your EFI alone can add more HP than a set of Tangerine headers.
Unless you want to send me a system to try out, an experienced engine builder...I have to say (IMG:style_emoticons/default/bs.gif)

[JamesM]

I have a real hard time believing that an EFI system on it's own gave any kind of a HP increase let alone a claimed almost 20%.

You're claiming that your EFI alone can add more HP than a set of Tangerine headers.
Unless you want to send me a system to try out, an experienced engine builder...I have to say (IMG:style_emoticons/default/bs.gif)

"Add" I don't believe is the correct word, I think unlocking the full potential is probably more accurate. I have heard similar numbers quoted by guys that went to extreme lengths to optimize and dial in their d-jet motors.

There are for sure gains to be had in in the midrange due to a fully programable 3d ignition map, and optimizations to efficiency across the board, but yes, in theory a perfectly dialed d-jet system at WOT might be able to hit the same PEAK numbers(while sacrificing performance in other areas) , but who has perfectly dialed in d-jet system and with d-jets age and analog nature how well does that tune even hold once dialed in??



This here is a fun read:

http://www.1800philes.com/tuning_article.html

This write up was part of my inspiration when i initially converted my car to Megasquirt back in 2004, this was my main reference as up to that point no one had done a 914. Very similar situation to this volvo 1800 in that it started as a 2.0 d-jet car, and you will see the outcome is similar to what has been reported here. Note the issue he has with d-jet on his initial Dyno pulls, the max power he was able to dial after tweaking d-jet, and then the max power he dialed in after going to Megasquirt. Also note this install is with very early Megasquirt hardware, no ignition control, less accurate stock sensors, and 45 year old stock d-jet injectors, so i would bet it could be further optimized as well. 88HP on the initial run with d-jet, 102 on the MS pulls after tuning

Other interesting points was d-jet leaning out hard above 5000rpm and that by optimizing his d-jet setup for peak numbers he impacted power/driveability across the rest of the RPM range.

I have a hard time calling BS when dealing with hard data and dyno sheets.

oh, and after some headwork and adding ignition control he pulled 110hp to the wheels.
http://www.1800philes.com/splitting_hairs.html

[914_teener]

I have a real hard time believing that an EFI system on it's own gave any kind of a HP increase let alone a claimed almost 20%.

You're claiming that your EFI alone can add more HP than a set of Tangerine headers.
Unless you want to send me a system to try out, an experienced engine builder...I have to say (IMG:style_emoticons/default/bs.gif)

"Add" I don't believe is the correct word, I think unlocking the full potential is probably more accurate. I have heard similar numbers quoted by guys that went to extreme lengths to optimize and dial in their d-jet motors.

There are for sure gains to be had in in the midrange due to a fully programable 3d ignition map, and optimizations to efficiency across the board, but yes, in theory a perfectly dialed d-jet system at WOT might be able to hit the same PEAK numbers(while sacrificing performance in other areas) , but who has perfectly dialed in d-jet system and with d-jets age and analog nature how well does that tune even hold once dialed in??



This here is a fun read:

http://www.1800philes.com/tuning_article.html

This write up was part of my inspiration when i initially converted my car to Megasquirt back in 2004, this was my main reference as up to that point no one had done a 914. Very similar situation to this volvo 1800 in that it started as a 2.0 d-jet car, and you will see the outcome is similar to what has been reported here. Note the issue he has with d-jet on his initial Dyno pulls, the max power he was able to dial after tweaking d-jet, and then the max power he dialed in after going to Megasquirt. Also note this install is with very early Megasquirt hardware, no ignition control, less accurate stock sensors, and 45 year old stock d-jet injectors, so i would bet it could be further optimized as well. 88HP on the initial run with d-jet, 102 on the MS pulls after tuning

Other interesting points was d-jet leaning out hard above 5000rpm and that by optimizing his d-jet setup for peak numbers he impacted power/driveability across the rest of the RPM range.

I have a hard time calling BS when dealing with hard data and dyno sheets.

oh, and after some headwork and adding ignition control he pulled 110hp to the wheels.
http://www.1800philes.com/splitting_hairs.html

Oh boy...here we go again..arguing apples and oranges.


If I'd was considering doing aftermarket EFI on a TIV Id definately ask or have somebody that has done it before, especially on a new build.

Not a question of what is better....it's a question of what someone wants.