Mazda SL35 Tuning

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Tom Sleigh

Tom Sleigh

Member
Posts
55
Location
Avon, Bristol
Hi All,

After a bit of advice. I have a SL35 diesel in my defender. It boosts to 13psi but is pretty gutless. Especially going up hill.

It's an automatic coupled to a 1.4 transfer box. Automatic will likely have a bit of affect to its uphill torque but not much.

Going up hill I can do it at 55mph then it drops, and drops, then holds 38mph once it kicks down as revs drops. I've played with kickdown and no position improves the uphil performance.

It has a zexel mechanical pump (under licence from Bosch). It has a compensator so maybe it's not fuelling in line with boost?

I'm wondering if there is anyone in the southwest that deals with these old mech pumps. Everyone seems to use laptops now a days!
 
Last edited:
Tom Sleigh said:
Hi All,

After a bit of advice. I have a SL35 diesel in my defender. It boosts to 13psi but is pretty gutless. Especially going up hill.
It's an automatic coupled to a 1.4 transfer box. Automatic will likely have a bit of affect to its uphill torque but not much.
Going up hill I can do it at 55mph then it drops, and drops, then holds 38mph once it kicks down as revs drops. I've played with kickdown and no position improves the uphil performance.
It has a zexel mechanical pump (under licence from Bosch). It has a compensator so maybe it's to fuelling in line with boost?
I'm wondering if there is anyone in the southwest that deals with these old mech pumps. Everyone seems to use laptops now a days!
Click to expand...
Sell it and buy a proper vehicle with a big V8 petrol engine.
 
Tom Sleigh said:
Hi All,

After a bit of advice. I have a SL35 diesel in my defender. It boosts to 13psi but is pretty gutless. Especially going up hill.

It's an automatic coupled to a 1.4 transfer box. Automatic will likely have a bit of affect to its uphill torque but not much.

Going up hill I can do it at 55mph then it drops, and drops, then holds 38mph once it kicks down as revs drops. I've played with kickdown and no position improves the uphil performance.

It has a zexel mechanical pump (under licence from Bosch). It has a compensator so maybe it's not fuelling in line with boost?

I'm wondering if there is anyone in the southwest that deals with these old mech pumps. Everyone seems to use laptops now a days!
Click to expand...

Any smoke at all, even a whisp?
If its the same or along the same lines as the Bosch VE as fitted to the 200/300, then I would give her a little tickle.
 
lynall said:
Any smoke at all, even a whisp?
If its the same or along the same lines as the Bosch VE as fitted to the 200/300, then I would give her a little tickle.
Click to expand...

Very little at start up until warm but then no smoke. I can see the boost on the guage and hear it but I feel no difference. Like the fuelling isn't keeping up to match the boost.

Here is an image of my injection pump. Don't believe it's similar to the LR TDI?

You can see the manifold hose going to the back of it. Think I'm going to take it apart and see if there is a diaphragm or something in there. Might take the hose off and block it first and see if it smokes or if anything happens?

Shame there isn't any garages expirenced in these mechanical pumps.
 

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I've found my issue!

But I can't solve it so I will reach out to some specialists.

Compensator diaphragm is fine, but the rod is actuates is stuck, I've removed the rod and put it back in but I can't free it up. But it's certainly explains my problems.
 
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