Author Topic: 1.6 IDI Timing Advance Mod. (Read 50561 times)

FineFrank · « **Reply #15 on:** June 05, 2007, 03:13:09 pm »

Okay, a couple questions, sure to expose my ignorance.

Does this mod make the cold start function useless?

When timing the pump during a TB change, do I need to reinstall the shim?

Would pulling the cs knob ourt all the way accomplish the same thing?

How do you believe that mileage will be affected?

BTW- did the mod, got a bit more power, but more noise, too.

Thanks

foxracer1 · « **Reply #16 on:** June 05, 2007, 05:07:43 pm »

No to all of those. It just allows the pump to advance faster and a little more.

FineFrank · « **Reply #17 on:** June 05, 2007, 05:50:37 pm »

Okay, follow up question....

Before the mod, I could feel resistance when I pulled the cs knob . After the mod that resistance is gone. It seems intuitive that this mod has removed my cold start advance capability. Again, I'm ignernt-help me understand.
Thanks.

saurkraut · « **Reply #18 on:** June 06, 2007, 09:05:36 am »

Would some one please do a befor and after quantitative performance test of this "mod" and see if it does any good?

Like end speed over a measured distance.

I have a place that I can check to see if stuff I changed does any good every time. Its a slight uphill that begins where a 35 MPH zone ends, to a big white mail box next to the 55MPH sign, about 1/8 mile down the road. I nail the go pedal at the 45 sign, run it through the gears until I get to the big white mail box. As I pass it, I look at speed, boost and EGT. Tragically, I'm going a little over the posted speed at that point, so I really have to check six befor I nail it, and listen very carefully to the radar detector as well during the "test".

When I put the 135 bar injectors in my TD, I noticed a significant speed loss over my test strip. So thats why I'm really suspicious about this "mod".

Louder is not necessarily faster.

gldgti · « **Reply #19 on:** June 14, 2007, 06:49:04 am »

just did it on my 1.5 n/a

took me 10 minutes.

im not sure that theres any more noise, but certainly it wants to rev more - once it got over 3000 just wants to keep revving where before it was a little hesitant.

i think it could benefit from a little more advance too.... :-D

rallydiesel · « **Reply #20 on:** June 15, 2007, 05:19:07 pm »

I just went to do this mod and found there was no shim between the cover and the spring :? . I guess someone already did it before me. The spring is mostly green but the very end has some blue on it.

I am now awaiting the ARP studs so I can have some boostage fun.

jimfoo · « **Reply #21 on:** June 15, 2007, 06:56:14 pm »

Quote from: "rallydiesel"

I just went to do this mod and found there was no shim between the cover and the spring :? . I guess someone already did it before me. The spring is mostly green but the very end has some blue on it.

I am now awaiting the ARP studs so I can have some boostage fun.

I hope you put something between the spring and cover as it sounds like otherwise the spring will start making little metal shavings.

Black Smokin' Diesel · « **Reply #22 on:** June 24, 2007, 05:16:38 pm »

I remove the cover from my spare TD pump and foud the spring/shims out. The spring is half blue, half green... so what strenght is this spring :?

subsonic · « **Reply #23 on:** June 25, 2007, 10:46:51 am »

that almost looks like heat treating.

rallydiesel · « **Reply #24 on:** June 25, 2007, 02:09:23 pm »

Quote from: Black Smokin' Diesel

I remove the cover from my spare TD pump and foud the spring/shims out. The spring is half blue, half green... so what strenght is this spring :?

Mine is the same. :?:

HarryMann · « **Reply #25 on:** June 27, 2007, 07:36:22 pm »

This whole thread so far sounds a bit inconclusive... don't think i shall be messing with mine yet :cry:

I imagine it depends a lot on the pump, the engine state, the timing advance you're already using, and a lot more besides.

Black Smokin' Diesel · « **Reply #26 on:** June 30, 2007, 04:43:23 pm »

Alright I did the mod a few hours ago and went for a ride. At first I thought it didn't do anything, especially in city driving. Once I got on the highway, I noticed the engine had a bit more go in the highr RPM range (3000+).

I think the results would be more noticeable if I had used a green spring but the only two I had were blue (or blue/green as above). There were three thin shims so I removed one of them, hence the minimal improvement. I can't comment about fuel mileage but I gotta fill her up tonight, well see if it changes anything.

ODwyerPW · « **Reply #27 on:** July 05, 2007, 12:08:48 am »

black smokin diesel,

any change in your mileage? any more smoke?

hillfolk'r · « **Reply #28 on:** July 19, 2007, 11:08:31 pm »

Quote from: "FineFrank"

Okay, follow up question....

Before the mod, I could feel resistance when I pulled the cs knob . After the mod that resistance is gone. It seems intuitive that this mod has removed my cold start advance capability. Again, I'm ignernt-help me understand.
Thanks.

ever had that pressed in pin in the back of the advance piston come loose where the cold start cam rides on???
i wondered why my car had so much part throttle "pinging"
and pulling out the cs knob "felt wierd"
lucky that there was enough metal left to repeen the pin back in
i didnt notice any power increase or decrease when that happened
id maybe try there and remove that cold start assy to see if that pin mighta came out..........

carrizog60 · « **Reply #29 on:** July 26, 2007, 04:24:22 pm »

so, after all that time as anyone tested this and measured the gains?
worth to do?
none/minimal risks?