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Engine Specific Info and Questions => IDI Engine => Topic started by: foxracer1 on November 16, 2006, 02:28:53 pm

Title: Pump Mods/Gov Mod?
Post by: foxracer1 on November 16, 2006, 02:28:53 pm: So i did the Gov mod. I used a piece of 1/4" stainless tube to eliminate the intermediate spring and to preload the main spring 1/4". Now it idles fine crusies fine. But when i mat it the it doesn't pull as hard as say 85% throttle. I feel it is over fueling way to much cuz i'll get what looks like white smoke. I backed the full load fuel off but it just took away from the first 50% of the throttle then it was the same as before throught the rest of the travel.

The EGTs never went above 1100 but was around 700 just cruising at 45mph. I installed a SCed Corrado manifold with a modified dual downpipe. I put my probe in the port on the manifold that is in between the two ports. What are the usual temps to expect out of the egts?

I haven't had much road testing so next week when i do more i'll post more but if anyone has delt with the similar please let me know.
Title: Pump Mods/Gov Mod?
Post by: foxracer1 on November 20, 2006, 11:28:14 am: anyone???
Title: Pump Mods/Gov Mod?
Post by: AdAm84 on November 21, 2006, 05:17:11 pm: white smoke isn't good.
Title: is it Turbo on NA?
Post by: Giles@PerformanceDiesel on November 23, 2006, 07:06:59 pm: hi
u didn't mentionif it's a turbo or not?

if u have the non turbo then don't do the gov mod

Giles
Title: Pump Mods/Gov Mod?
Post by: foxracer1 on November 23, 2006, 08:39:58 pm: Yup its a non turbo. Whats the problem with doing it to a N/A? I have a Pyro, and all its doing is continuing to add fuel until the higher rpms. If there is more to know please let me know. I redid it with a shorter piece and it seems to run good really strong in the low to mid rpm, combined with the corrado manifold and downpipe. I just need to work on the intake.
Title: Pump Mods/Gov Mod?
Post by: Hillshy on November 26, 2006, 04:08:18 am: Hi all,

i'd also like to know why the Gov mod shouldn't be done on a N/A motor?

Hillshy
Title: problems
Post by: Giles@PerformanceDiesel on November 26, 2006, 06:36:12 am: u shouldn't do the part load gov mod since it changes the fuel
delivery the wrong way for a NA engine.

but do the max rpm gov mod though

Giles
Title: Re: problems
Post by: Benjamin on November 26, 2006, 09:04:37 am: Quote
u shouldn't do the part load gov mod since it changes the fuel
delivery the wrong way for a NA engine.

but do the max rpm gov mod though

Giles

so, only a stronger preload for the main spring, and not shimming the intermediate spring?!?

Greetz, Benjamin
Title: Re: problems
Post by: foxracer1 on December 14, 2006, 01:31:33 pm: Quote from: Giles@superiorFuelInj
u shouldn't do the part load gov mod since it changes the fuel
delivery the wrong way for a NA engine.

but do the max rpm gov mod though

Giles

That would make sense on the way the ole N/A is runnin. gonna switch it out this weekend. So the max rpm spring is the longer one?
Title: Pump Mods/Gov Mod?
Post by: hipifreq on December 14, 2006, 03:24:40 pm: Quote
Sounds like your timing is retarded.

Andrew

*COUGH*

Don't you mean "your timing has an intellectual disability?"

:wink:
Title: Re: problems
Post by: dover on December 18, 2006, 05:04:48 pm: Quote from: Giles@superiorFuelInj
u shouldn't do the part load gov mod since it changes the fuel
delivery the wrong way for a NA engine.

but do the max rpm gov mod though

Giles

OK... I'm a newb with an '85 Golf NA (with 1 leaking pump installed and several old "spares")
BUT: I have a seal kit (local Bosh service center) (http://www.dwdiesel.com/Images/BuffaloDir.pdf), the Bosch IP pdf (open... can't re-find the link), the "Governor Mod" (http://www.vwdiesel.net/phpBB/viewtopic.php?p=16606) and the "Governor Mod - Clarified" (http://www.vwdiesel.net/phpBB/viewtopic.php?t=3241) open and

I'm a little confused. The first one looks like a TD IP (I got no diaphragm on mine). Am I going for the second one?
Just the intermediate spring or just the shims on the big spring?

Is this the figure I need to fully grasp:
(http://i40.photobucket.com/albums/e226/BD-Fuel/BD%20Prod%20Sys%20Ext/BoschManualFigure7.png)

I don't want to race but I hate it when they show up in the rear view on long climbs.

If I do manage to up the power will methanol/water injection make any difference in an N/A?
Title: Pump Mods/Gov Mod?
Post by: rabbitman on December 19, 2006, 12:31:17 am: what is the dif between a part load gov mod and a max rpm gov mod? or did I miss a simple thing? :?
Title: Pump Mods/Gov Mod?
Post by: Bean on May 25, 2007, 04:28:10 am: Anybody cleared this up yet?
Does giles mean that you should only pre-load the main spring and leave the intermediate in tact for a N/A diesel?
Title: Pump Mods/Gov Mod?
Post by: Baxter on May 25, 2007, 11:58:38 am: I tried this.

I have a NA caddy, I did both mods, it was okay, but as stated it didn't feel as quick when booted.

So, I undid one of the mods and it worked a teat.

Caddy now pulls harder all the way up the rev range.
Title: Pump Mods/Gov Mod?
Post by: Bean on June 06, 2007, 09:03:19 am: Which mod did you undo? Shimming/replacing the intermediate spring, or shimming the main spring?

My pump is leaking and I think the O ring is probably shot, so I want to do this when I replace that but I need to be sure which mod to do before I pull things apart.

Cheers :wink:
Title: Pump Mods/Gov Mod?
Post by: jimfoo on June 06, 2007, 09:45:14 am: I believe you should only shim the main spring. I did just the intermediate spring, and although I haven't driven it yet, I don't like the way that you give it a little pedal and the rpm's start creeping up, then all of a sudden go way up.
Title: Pump Mods/Gov Mod?
Post by: Bean on June 06, 2007, 10:03:00 am: Is that on an N/A engine?

Can anybody else confirm this?
Title: Pump Mods/Gov Mod?
Post by: jimfoo on June 06, 2007, 07:12:41 pm: It is on either engine. This is also what Named TinTin stated in another post, unfortunately after I did the intermediate mod.
Title: Pump Mods/Gov Mod?
Post by: Bean on June 07, 2007, 01:20:46 am: It can't be on either engine, because the gov mod guide for the turbo'd engines say to do both intermediate and main spring mods. And giles mentioned to only do one of the mods on the N/A engine. (If I understand correctly)
:?: :?:

I just wanted to confirm if you were having these problems with an N/A or not.

So, how much am I shimming the main spring by, if that's the right one to do?
Title: Pump Mods/Gov Mod?
Post by: foxracer1 on June 07, 2007, 04:15:13 am: The reason you should only do one spring on a NA is the fact that it has no turbo and can't use all of the fuel. It just over fuels because the lack of boost.
Title: Pump Mods/Gov Mod?
Post by: jimfoo on June 07, 2007, 05:43:12 am: Correct. And the reason Named TinTin states to not do it on the turbo is because it can cause driveability issues.